Mastitis detail explanation with respect to veterinary medicine 4th year I want genuine information and practical base treatment for obtaining good marks.
mastitis veterinary medicine bovine classification pathogenesis treatment 4th year
bovine mastitis udder inflammation pathology clinical signs
Clinical and gross pathology photographs demonstrating the tissue-level manifestations of Schistosoma japonicum infection. Panel A shows a clinical photograph of the skin on the inner thigh of a bovine model. The image exhibits visible signs of inflammation, characterized by localized erythema and edema. White arrows specifically indicate raised, papular inflammatory reactions at the site of cercarial penetration five days post-infection. Panel B displays a gross pathological view of a liver surface during necropsy. The liver parenchyma shows evidence of chronic schistosome infection. Black arrows highlight numerous, discrete white nodules (granulomas) distributed across the organ surface. These nodules are indicative of egg-induced pathology, where the host immune response forms fibrotic granulomatous lesions around trapped parasite eggs. This comparison illustrates the transition from the acute cutaneous phase of schistosomiasis (swimmer's itch/cercarial dermatitis) to the chronic visceral phase involving hepatic egg pathology.
This clinical photograph panel illustrates mammary gland pathology and treatment efficacy in a mouse model of Staphylococcus aureus-induced mastitis. The visual is organized into a healthy control (CT) group and two infection groups (S. aureus ATCC 25923 and S. aureus GS 1311), further subdivided by treatment status: Untreated, C16dKdK (synthetic lipopeptide), and cefotaxime (antibiotic). Each row displays the external appearance in the first column and internal mammary tissue pathology in the second and third (magnified) columns. Untreated infected groups demonstrate clinical signs of acute mastitis, including external redness and swelling, and internal tissue congestion with prominent hemorrhage. Comparative analysis shows that mice treated with C16dKdK exhibit a significant reduction in mammary tissue congestion and absence of visible bleeding, appearing similar to the healthy control. In contrast, the cefotaxime-treated group shows partial recovery but retains areas of persistent congestion and pitting bleeding. The image serves as a visual demonstration of the comparative therapeutic efficacy between novel lipopeptides and traditional antibiotics in resolving infectious inflammation of the mammary glands.
This image consists of three stacked boxplots (A, B, and C) illustrating the ecological diversity of the bovine udder microbiota across individual subjects. The x-axis identifies individual cows, categorized by farm origin (Prefix A or K). Panel A displays the Chao1 index, an estimator of species richness, showing significant variation between individuals with values ranging from near 0 to over 400. Panel B presents the Shannon diversity index, measuring both richness and evenness, with most values concentrated between 1 and 5. Panel C shows the multivariate homogeneity of group dispersions (beta dispersion) based on the Bray–Curtis dissimilarity matrix, reflecting the stability and variation of the microbial community within each cow's quarters. Values here are primarily between 0.4 and 0.8. Collectively, these plots demonstrate the inter-individual variability in microbial composition in the context of veterinary clinical research and mastitis studies, highlighting how richness and diversity are distributed at the individual host level.
This set of four clinical photographs demonstrates the comparative pathology of digital dermatitis (DD) on the pastern and interdigital region of bovine feet, serving as a model for infectious skin lesions. Panels A and B display control subjects with normal clinical findings: the skin is intact, pale pink to white in color, and possesses a smooth, continuous texture with a normal, undisturbed hair coat. In contrast, panels C and D illustrate severe induced lesions (score 10). These lesions are characterized by marked erythematous inflammation, focal ulceration, and the presence of granular, raw tissue. The affected areas show distinct signs of exudative discharge, causing matted and discolored hair at the periphery. The lesions exhibit irregular borders and apparent tissue depth, consistent with high-grade inflammation and vascular involvement typical of active digital dermatitis. This comparison is used in dermatology and veterinary medicine to teach the visual identification, macroscopic scoring, and clinical manifestation of acute ulcerated skin conditions.
https://www.merckvetmanual.com/reproductive-system/mastitis-…
bovine mastitis treatment intramammary antibiotics
California mastitis test CMT strip cup milk somatic cell count
A multi-panel scientific figure displaying four rows of comparative boxplots (A–D) representing longitudinal udder microbiota data from 10 cows across six samplings. The cows are categorized into two groups: Low Somatic Cell Count (L-cows, L1–L5, shown in blue) and High Somatic Cell Count (H-cows, H1–H5, shown in yellow). Row A illustrates Somatic Cell Count (SCC), where L-cows demonstrate consistently low, stable levels while H-cows exhibit significantly elevated and fluctuating SCC values. Row B (Shannon diversity) and Row C (Chao1 index) represent alpha diversity metrics; L-cows show higher species evenness and richness with narrower interquartile ranges compared to the H-cows, which display lower diversity and higher variability. Row D shows 'Multivariate homogeneity of group dispersions' (beta dispersion), indicating that L-cows maintain a more stable microbial community over time, whereas H-cows exhibit greater dispersion and temporal instability. The data illustrates the relationship between inflammatory markers (SCC) and the health/stability of the bovine mammary microbiome, used here as a comparative model for infection and dysbiosis.
A clinical laboratory report document presented in both original Chinese and translated English, detailing a 'milk-like fluid analysis'. The report header identifies the patient as a 39-year-old male from a Cardiac Surgery Intensive Care Unit (ICU). The data table presents five key parameters: Color (milky/yellow), Appearance (muddy/turbid), Rivalta test (result of +1, indicating the presence of serous exudate protein), White blood cell (WBC) count (1-2 per high-power field), and Red blood cell (RBC) count (described as scanty or homogeneous). This fluid was obtained clinically during a pericardiectomy for localized chronic constrictive pericarditis (CP). The laboratory findings help characterize the fluid gush (chylopericardium vs. inflammatory exudate) encountered during the surgical decompression of the calcified pericardium.
This diagnostic ultrasound image demonstrates the classic sonographic features of acute mastitis in a lactating breast. The image shows prominent skin thickening and increased hyperechogenicity of the subcutaneous tissues. The underlying breast parenchyma exhibits a markedly echogenic and heterogeneous appearance, resulting in a loss of the normal ultrasonic distinction between glandular and adipose tissues. Specifically, dilated, non-compressible milk ducts are visible, appearing as hypoechoic tubular structures amidst the dense stroma. Furthermore, visible skin lymphatics and interstitial fluid signify active inflammation and edema. These features—parenchymal echogenicity, ductal distension, and cutaneous changes—are key educational indicators used to differentiate inflammatory processes from localized abscesses or normal lactational changes in a clinical setting.
Mastitis in Veterinary Medicine - Comprehensive 4th Year Guide
1. DEFINITION
2. ETIOLOGY (Causative Agents)
A. Bacterial Causes (Most Common - >137 species documented)
| Category | Organisms | Type |
|---|---|---|
| Gram-positive cocci | Staphylococcus aureus (major), CoNS, Streptococcus agalactiae, S. uberis, S. dysgalactiae | Contagious & Environmental |
| Gram-negative bacilli | E. coli, Klebsiella spp., Enterobacter spp. (Coliforms) | Environmental |
| Others | Mycoplasma bovis, Corynebacterium bovis, Arcanobacterium pyogenes, Bacillus spp. | Contagious/Environmental |
- S. agalactiae - obligate intramammary pathogen; lives only in the udder; highly contagious
- S. aureus - most difficult to treat due to intracellular survival, biofilm formation, and AMR
- Coliforms - environmental, peak at periparturient period; cause acute/peracute mastitis
B. Fungal / Mycotic Causes
- Candida spp., Aspergillus fumigatus, Prototheca zopfii (algal mastitis)
- Typically follow prolonged or improper antibiotic use; treatment not generally successful
C. Viral Causes
- BHV-1, BHV-4, FMD virus, Parainfluenza-3, Cowpox, Pseudocowpox
- Bovine viral diarrhea virus (BVDV), BIV, BLV act indirectly via immunosuppression
3. PREDISPOSING FACTORS
- Cow-level: Poor teat end condition, parity (older cows), stage of lactation, dry period, periparturient immunosuppression
- Machine-related: Faulty milking machine (irregular vacuum, liner slippage), improper milking technique
- Environmental: Poor hygiene, wet/dirty bedding, overcrowding
- Managerial: No teat dipping, poor dry cow therapy, failure to cull chronic cases
4. PATHOGENESIS
- Entry - Pathogens enter via the teat canal (streak canal). The teat sphincter and keratin lining are the first defense barriers.
- Colonization - Bacteria adhere to mammary epithelium, multiply in milk cistern and alveolar spaces.
- Toxin release - Bacterial toxins (hemolysins, leukotoxins, endotoxins in coliforms) damage epithelium.
- Inflammatory cascade - Lipopolysaccharide (LPS from gram-negatives) triggers IL-1, IL-6, TNF-α release. Prostaglandins and arachidonic acid metabolites cause vasodilation, increased vascular permeability.
- Leukocyte infiltration - Massive influx of neutrophils into milk → somatic cell count (SCC) rises sharply (normal <200,000 cells/mL; mastitis >500,000 cells/mL).
- Tissue damage - Neutrophil-derived reactive oxygen species and proteases destroy alveolar epithelium, reduce milk synthesis.
- Fibrosis - Chronic infections lead to irreversible fibrosis, reduced secretory tissue, and permanent agalactia.
5. CLASSIFICATION
A. Based on Clinical Presentation
| Type | Features |
|---|---|
| Peracute | Sudden onset, severe udder edema/pain/heat, high fever (40-41°C), systemic toxemia, recumbency, can be fatal - classic with coliforms |
| Acute | Sudden onset, marked udder changes, altered milk, fever, reduced appetite/milk yield |
| Subacute | Mild udder changes, slightly altered milk (flakes, clots), no fever - common with S. uberis |
| Chronic | Recurrent flare-ups, fibrosis, hardening of quarters, persistent elevated SCC - classic with S. aureus |
| Subclinical | No visible changes; only elevated SCC and bacteriological changes in milk - most economically significant as it is invisible |
B. Based on Etiology
- Bacterial, Fungal/Mycotic, Viral, Algal (Prototheca)
C. Histopathological Classification
D. Based on Pathogen Ecology
- Contagious (cow-to-cow spread, primarily at milking): S. aureus, S. agalactiae, Mycoplasma bovis
- Environmental (from cow's environment): Coliforms, S. uberis, S. dysgalactiae
6. CLINICAL SIGNS
Local Signs (Udder/Milk)
- Udder: Swelling, heat, pain, redness, induration, atrophy (chronic)
- Milk changes: Watery/serous milk, clots, flakes, blood-tinged milk, altered color/consistency
- Quarter asymmetry: Atrophy of chronic quarters visible at inspection
Systemic Signs (Peracute/Acute)
- Pyrexia (40-41.5°C)
- Anorexia, depression
- Reduced rumen motility
- Tachycardia, tachypnea
- Dehydration, recumbency in severe cases
- Endotoxic shock (coliform mastitis)
7. DIAGNOSIS
A. Physical Examination
- Strip cup test: First 3-4 streams of milk into a dark-bottomed cup; check for clots, flakes, changed consistency - quick, bedside test
- Forestripping: Done before every milking; reveals subclinical changes
B. California Mastitis Test (CMT) - Most Practical Field Test
- Principle: Detects elevated SCC. The reagent (anionic detergent) lyses leukocyte cell membranes, releasing DNA which forms a gel.
- Scoring:
| Score | Reaction | SCC (cells/mL) | Interpretation |
|---|---|---|---|
| 0 (Negative) | No precipitation | <200,000 | Normal |
| Trace | Slight precipitation, disappears | 150,000-500,000 | Suspicious |
| 1+ | Distinct precipitation, no gel | 400,000-1,500,000 | Subclinical |
| 2+ | Gel forms, moves to center | 800,000-5,000,000 | Clinical |
| 3+ | Thick gel, does not flow | >5,000,000 | Severely infected |
C. Milk Culture & Sensitivity (Gold Standard)
- Aseptically collected milk sample → bacterial culture
- Identifies causative organism → guides antibiotic selection
- Gram stain for rapid preliminary identification
D. Somatic Cell Count (SCC)
- Electronic cell counting (Fossomatic)
- Bulk tank SCC: <200,000 cells/mL = acceptable; >400,000 = problem herd
- Individual cow SCC >200,000 suggests subclinical mastitis
E. Other Tests
- Whiteside test: NaOH-based field test (less popular)
- Surf field mastitis test: Modified CMT
- Bromothymol blue test: pH-based test
- Electrical conductivity: Automated inline mastitis detection
- Ultrasound: Identifies abscesses, fibrotic areas in chronic mastitis
- Histopathology: Biopsy for chronic/atypical cases
8. TREATMENT - Practical Protocol
Principles of Treatment
- Identify causative organism whenever possible
- Begin treatment early for best outcomes
- Choose appropriate drug, dose, route, and duration
- Follow milk/meat withdrawal times
- Support therapy for systemic cases
A. Intramammary (IMM) Therapy - First Line
| Drug | Product Example | Use |
|---|---|---|
| Penicillin G + Novobiocin | MastiCillin, Albadry | Gram-positive (Strep, Staph) |
| Amoxicillin | Amoxicillin IMM | Gram-positive, broad spectrum |
| Cloxacillin | Orbenin, Cloxapen | S. aureus (beta-lactamase stable) |
| Cefquinome | Cobactan IMM | Broad spectrum, 3rd gen cephalosporin |
| Pirlimycin | Pirsue | S. aureus, Streptococci |
| Ceftiofur | Spectramast LC/DC | Broad spectrum, short withdrawal |
- Strip quarter completely (empty milk)
- Clean and disinfect teat end with alcohol swab
- Partially insert cannula (partial insertion reduces teat canal trauma)
- Infuse product
- Dip teat with post-dip solution
- Note: Teat canal massage toward cistern helps drug distribution
B. Systemic (Parenteral) Therapy
| Drug | Dose & Route | Indication |
|---|---|---|
| Penicillin G procaine | 22,000 IU/kg IM BID | Gram-positive mastitis |
| Ampicillin | 5-10 mg/kg IM/IV BID | Broad spectrum |
| Ceftiofur sodium | 2.2 mg/kg IM SID | Broad spectrum, coliform mastitis |
| Enrofloxacin | 5 mg/kg SC SID (cattle) | Gram-negative, mycoplasma |
| Tetracycline | 10-20 mg/kg IV SID | Mycoplasma mastitis |
| Gentamicin | 4-6 mg/kg IV/IM SID | Gram-negative coliform (extra-label use) |
C. Anti-Inflammatory / Supportive Therapy (Critical for Peracute Cases)
| Drug | Dose | Purpose |
|---|---|---|
| Flunixin meglumine | 2.2 mg/kg IV/IM SID | NSAID of choice for endotoxemia; inhibits PGE2, reduces fever, pain |
| Meloxicam | 0.5 mg/kg IV/SC | Selective COX-2 inhibitor, good tissue penetration |
| Dexamethasone | 0.02-0.04 mg/kg IM | Anti-inflammatory for severe cases (caution - immunosuppressive, can trigger abortion) |
| IV fluids | Hartmann's/LRS 20-40 L | Dehydration, endotoxic shock (coliform mastitis) |
| Oxytocin | 20 IU IV/IM | Promotes milk let-down and drainage, flush out bacteria |
| Vitamin C | 10-30 g IV | Antioxidant support, especially useful in coliform mastitis |
| Calcium borogluconate | 400 mL IV | If concurrent milk fever/hypocalcemia (common periparturient) |
D. Dry Cow Therapy (DCT) - Most Economically Important Prevention Strategy
- Treat ALL quarters with long-acting IMM antibiotic at dry-off
- Teat sealants (Orbeseal, Teatseal) provide physical barrier
| Drug | Product | Duration |
|---|---|---|
| Cloxacillin benzathine | Orbenin DC | 8-12 weeks |
| Ampicillin + Cloxacillin | Ampiclox DC | 6-8 weeks |
| Cefquinome | Cobactan DC | 6-8 weeks |
E. Treatment Outcomes by Pathogen
| Pathogen | Prognosis | Comments |
|---|---|---|
| S. agalactiae | Excellent | Almost 100% cure with penicillin |
| Streptococcus spp. | Good | 70-80% cure |
| S. aureus | Poor-Fair | <40% bacteriological cure; biofilm, intracellular survival |
| E. coli | Variable | Self-limiting mild cases; severe/peracute has 30-50% death/cull rate |
| Klebsiella | Poor | Worst prognosis among coliforms; 2x more likely to die/cull |
| Mycoplasma bovis | Very poor | Essentially untreatable; cull affected cows |
| Fungal/Prototheca | Very poor | Treat with iodine infusion; cull is usually recommended |
F. When NOT to Treat (Selective Dry Therapy / Culling)
- Chronic S. aureus mastitis (>3 clinical episodes)
- Mycoplasma bovis positive (risk to whole herd)
- Prototheca/fungal mastitis
-
3 quarters affected chronically
- Non-productive or low-value animals
9. PREVENTION AND CONTROL - The 5-Point Plan (National Mastitis Council)
- Proper milking hygiene: Pre-dip, dry with individual towels, post-dip (iodophor 0.5% or chlorhexidine 0.5%)
- Milking machine maintenance: Regular servicing, correct vacuum levels (40-50 kPa), liner replacement
- Dry cow therapy: Treat ALL cows at drying off
- Cull chronic cases: Eliminate reservoir animals
- Good record keeping: Monitor SCC trends, identify problem animals early
- Pre-dip: 30-second contact time, then dry
- Post-dip: Apply immediately after unit removal, 2/3 teat coverage
10. ECONOMIC SIGNIFICANCE
- A single clinical mastitis case costs approximately $400-$500 USD (treatment + milk loss + labor)
- Subclinical mastitis reduces milk yield by 10-25% per affected quarter
- SCC >400,000 cells/mL results in milk rejection/price penalties
- Mastitis is responsible for ~17% of dairy cow cullings
11. MASTITIS IN OTHER SPECIES
| Species | Common Cause | Notes |
|---|---|---|
| Buffalo | Similar to cattle; S. aureus, Streptococcus | Higher prevalence of subclinical form |
| Goat | Staphylococcus aureus, Caprine arthritis encephalitis virus (CAEV) | CAEV causes chronic indurative mastitis |
| Sheep | Mannheimia haemolytica, Staphylococcus | Can be peracute gangrenous |
| Mare (Horse) | Streptococcus zooepidemicus, S. aureus | Uncommon; usually at weaning |
| Sow (Pig) | MMA syndrome (E. coli, Klebsiella) | Mastitis-Metritis-Agalactia complex postpartum |
12. KEY EXAM POINTS (High-Yield for 4th Year)
- CMT is the most practical field-side screening test for subclinical mastitis
- Bulk tank SCC is the most important herd-level monitoring tool
- S. agalactiae is the most sensitive to penicillin and nearly 100% curable
- S. aureus is the hardest to treat due to intracellular survival and biofilm
- Coliform mastitis is the most dangerous (endotoxemia, shock, death)
- Oxytocin + frequent milking is a key adjunct treatment
- Flunixin meglumine is the NSAID of choice for endotoxemia in mastitis
- Dry cow therapy is the single most effective mastitis control strategy
- Mycoplasma mastitis - no cell wall, beta-lactams useless, cull recommended
- The teat canal (streak canal) is the primary defense against intramammary infection
- SCC normal = <200,000 cells/mL in individual cows
- Prognosis: S. agalactiae > Streptococcus > S. aureus > Coliforms > Klebsiella > Mycoplasma/Fungal (in order of decreasing treatment success)
13. RECENT EVIDENCE (PubMed 2023-2025)
- A meta-analysis on S. aureus AMR in Iran (PMID: 37302281) confirmed high-level antibiotic resistance, reinforcing the need for culture-guided therapy before treatment.
- A systematic review on S. uberis AMR (PMID: 37844492) highlights increasing resistance in environmental streptococci, justifying sensitivity testing.
- A 2025 network meta-analysis on dry-off interventions (PMID: 40073588) found that combining internal teat sealants with antibiotics at dry-off gives the best protection against new intramammary infections.
Quick Reference Diagram: Pathogenesis Flow
Teat canal penetration
↓
Bacterial colonization in milk cistern
↓
Toxin/LPS release
↓
Cytokine cascade (IL-1, IL-6, TNF-α)
↓
Neutrophil infiltration → ↑SCC
↓
Epithelial damage + ↓milk production
↓
Chronic: Fibrosis → Agalactia
Acute: Systemic SIRS → Endotoxemia → Shock
Glander details explanation I want hindenglish language for batter understand core of topic
Glanders disease Burkholderia mallei veterinary pathogenesis clinical signs treatment diagnosis horses
Glanders horse nasal discharge nodules skin farcy Burkholderia mallei
Content Type: Clinical Photograph. This image displays multiple skin lesions on a 45-year-old male. The primary visual finding is a large, infiltrated, nodular plaque covering the majority of the nasal bridge and tip, appearing raised with areas of surface irregularity and mild serosanguinous discharge. Secondary lesions include a well-demarcated, hypopigmented, and scaly plaque on the dorsum of the left wrist and a similar infiltrated nodule on the right index finger. Medical Context: These clinical manifestations are consistent with Post-Kala-azar Dermal Leishmaniasis (PKDL) in an HIV-positive patient, characterized by disseminated nodules and plaques containing Leishman-Donovan bodies. Educational Significance: The photograph illustrates the atypical and more aggressive presentation of cutaneous leishmaniasis in immunocompromised individuals. Target Audience: Dermatologists, infectious disease specialists, and medical students. Keywords: Infiltrated plaque, nodular lesion, hypopigmentation, nasal lesion, cutaneous leishmaniasis, HIV-coinfection, tropical medicine.
This clinical photograph consists of two panels illustrating cutaneous manifestations of tophaceous gout in a 62-year-old patient. Panel A displays the nasal region in a profile view, featuring a large, firm, erythematous nodule on the nasal dorsum. The lesion is notable for its central ulceration and yellowish-white amorphous discharge, characteristic of urate crystal deposits (tophus). Surrounding skin shows telangiectasia and smaller satellite papules. Panel B provides a lateral view of the right external ear, demonstrating multiple small, firm, yellowish-white papules and nodules along the helix and antihelix. These lesions are discrete, non-ulcerated, and represent classical gouty tophi in a common anatomical site. The image serves as an educational reference for identifying extra-articular manifestations of chronic hyperuricemia and the varied morphology of tophi, ranging from small auricular papules to large, ulcerating facial nodules.
Clinical photography of the nasal and perinasal facial skin in visible light, captured as a close‑up frontal view. The image depicts bilateral perinasal/nasal skin with raised pink to erythematous nodules on the nasal ala and adjacent cheek. Lesions are firm, well circumscribed but with irregular, possibly ulcerated surfaces and focal crusting. The surrounding skin appears mildly scarred and sun‑exposed, consistent with chronic actinic damage. The right nasal lesion shows a slightly larger, rounded dome shaped nodule with an attenuated pearly/pink appearance and subtle surface erosion; the left lesion is smaller and less well defined. No deep tissue involvement is ascertainable from this external view. There is no dermatoscopic detail. The clinical significance is high: new or enlarging cutaneous nodules on the nose region raise suspicion for malignant skin neoplasms such as basal cell carcinoma or squamous cell carcinoma, though benign mimics (sebaceous hyperplasia, keratoacanthoma) are possible. The image is valuable for educational purposes, differential diagnosis discussion, and biopsy planning. Potential clinical use cases include triage in primary care, dermatology assessment, radiology correlation for facial skin cancer staging, and teaching of lesion morphology. This representation aids pattern recognition and correlates with sun‑related skin cancer risk and perinasal oncologic workup and management.
This clinical photograph shows a close-up frontal view of a patient's face, focusing on a solitary, erythematous nodule located on the right nasal sidewall. The primary lesion is approximately 0.5 cm in diameter, well-demarcated, and exhibits a characteristic central ulceration or crateriform appearance. The surrounding nasal skin shows mild erythema and several smaller, non-specific pigmented macules. The background facial skin displays signs of solar elastosis and actinic damage, including uneven texture and dyschromia. This visual presentation is clinically significant for the differential diagnosis of cutaneous neoplasms, particularly keratoacanthoma or basal cell carcinoma, though the pathological diagnosis in this specific case is angiolymphoid hyperplasia with eosinophilia (ALHE). The image serves as an educational resource for identifying umbilicated or ulcerated skin nodules on sun-exposed facial areas in dermatology and oncology curricula.
https://www.merckvetmanual.com/generalized-conditions/glande…
"Burkholderia mallei" glanders diagnosis treatment
🐴 GLANDERS (Ander) - Complete Veterinary Guide
Hinglish mein - 4th Year ke liye
1. DEFINITION (Parichay)
- Caused by: Burkholderia mallei (pehle Pseudomonas mallei kehte the)
- Iska skin form "FARCY" kehlaata hai
- India mein yeh Notifiable Disease hai - matlab case hone par government ko report karna compulsory hai
- OIE (World Organisation for Animal Health) listed disease hai
Yaad rakho: Glanders = Respiratory + Nasal + Skin nodules wali disease in horses. Farcy = Sirf skin/lymphatic form ka naam.
2. CAUSATIVE AGENT (Kaaran)
| Property | Detail |
|---|---|
| Organism | Burkholderia mallei |
| Gram stain | Gram-NEGATIVE bacillus (rod shape) |
| Motility | NON-MOTILE (non-motile hona iska distinct feature hai) |
| Oxygen | Strictly aerobic (oxygen chahiye) |
| Intracellular | Facultative intracellular parasite (cell ke andar bhi survive karta hai) |
| Origin | Pathoadaptive clone hai B. pseudomallei se |
| Survival | Direct sunlight, desiccation, aur common disinfectants se kill ho jaata hai |
| Bioterrorism | B. mallei ko potential bioterrorism agent classify kiya gaya hai kyunki untreated septicemia mein 40-95% mortality humans mein |
- Pyocyanin - electron transfer interfere karta hai
- Lecithinase - cell lysis karta hai
- Collagenase - connective tissue destroy karta hai
- Lipase & Hemolysin - tissue damage
3. HOST RANGE (Kaun kaun bimaar hota hai)
| Species | Susceptibility |
|---|---|
| Mule (Khacchar) | Sabse zyada susceptible - Peracute, rapid death |
| Donkey (Gadha) | Highly susceptible - usually fatal, acute form |
| Horse (Ghoda) | Relatively resistant - Chronic form (farcy) develop karta hai, carrier ban sakta hai |
| Camel, Tiger, Lion | Uncommon but usually fatal if infected |
| Human | Zoonotic infection possible - occupational risk |
| Cattle, Pig, Dog | Natural resistance hoti hai |
Trick: "MD Fatally Die" - Mule = Die fastest. Horse = chronic survivor.
4. TRANSMISSION (Failna kaise hai)
Infected animal
↓
Nasal discharge / Skin secretions / Pus
↓
Direct contact ←→ Contaminated feed/water/trough
↓
Entry via:
→ Nasal mucosa (sabse common)
→ Skin abrasion/wounds
→ Mouth (ingestion)
→ Aerosol (laboratory mein)
- Contagious spread milking time pe ya shared water/feed troughs se hota hai
- Carrier horses (occult glanders) - jo dikhne mein normal lagte hain but infected hain - sabse dangerous source of spread
- Infected stallion → breeding ke time mein spread
5. PATHOGENESIS (Andar kya hota hai)
- Pehle firm hota hai
- Phir soften hota hai (liquefaction necrosis)
- Phir rupture ho jaata hai
- Rupture ke baad ulcer banta hai - ulcer se honey-like discharge aata hai
- Lymphatic vessels mein beads jaisi nodules banti hain = "Farcy buds"
- Lymphatic vessels thickened, cord-like ho jaate hain = "Farcy pipes"
- Multiple organ nodules
- Septicemia → Multi-organ failure → Death
6. FORMS / CLASSIFICATION (Kitni tarah ka hota hai)
A. NASAL FORM (Naak waala form)
- Sabse common
- Unilateral ya bilateral nasal discharge - pehle watery, phir mucopurulent (thick yellowish-green)
- Nasal mucosa par nodules bante hain → rupture → ulcers → heal ho ke stellate scars (taare jaisi daag) banti hain
- Nasal septum perforation ho sakti hai
- Submaxillary lymph nodes enlarge ho jaate hain - ek taraf (rope jaisa, hard)
B. PULMONARY FORM (Phepde waala form)
- Bacteria inhale hone se
- Chronic dry cough, labored breathing, weight loss
- Lungs mein nodules bante hain jo necrotic (dead tissue) ho jaate hain
- X-ray: Multiple nodular lesions in lungs
- Usually chronic course - weeks to months
C. CUTANEOUS FORM = FARCY (Chara ki bimari)
- Skin aur lymphatics involve hoti hain
- Farcy buds: Skin aur subcutaneous tissue mein nodules along lymphatic vessels
- Farcy pipes: Lymphatic vessels thickened, cord jaisi feel hoti hain (palpate kar sakte ho)
- Nodules rupture ho ke ulcers banaate hain with honey/oily discharge
- Mostly medial aspect of hind limbs aur neck par
D. ACUTE SEPTICEMIC FORM
- Donkeys aur mules mein sabse common
- High fever (40-41°C), complete anorexia, severe depression
- Rapid deterioration → Death within 3-4 days
- Nodules dikhne ka time bhi nahi milta
E. CHRONIC FORM
- Horses mein
- Waxing and waning course - kabhi theek lagta hai kabhi bura
- Months to years tak chal sakta hai
- Carrier state possible - Occult Glanders
7. CLINICAL SIGNS - Quick Summary Table
| Sign | Form |
|---|---|
| Thick yellowish-green nasal discharge | Nasal |
| Ulcers with stellate scars in nasal mucosa | Nasal |
| Hard, rope-like submaxillary lymph nodes | Nasal |
| Cough, difficulty breathing, weight loss | Pulmonary |
| Skin nodules along lymphatics (farcy buds) | Cutaneous/Farcy |
| Cord-like thickened lymphatics (farcy pipes) | Cutaneous/Farcy |
| High fever, rapid death | Acute/Septicemic |
| Emaciation, debilitation, chronic course | Chronic |
8. DIAGNOSIS (Pehchaanna kaise hai)
A. CLINICAL DIAGNOSIS (Dekhke)
- Nasal discharge + nasal ulcers + stellate scars = strongly suspect glanders
- Farcy buds along medial hind limb lymphatics
- Submaxillary lymph node enlargement
Caution: Occult glanders (carrier animals) mein koi sign nahi hote - tabhi specific tests important hain
B. MALLEIN TEST - Most Important Practical Diagnostic Test ⭐
| Type | Method | Reading |
|---|---|---|
| Ophthalmic (Intrapalpebral) - Gold Standard | 0.1 mL mallein intradermal injection in lower eyelid | After 24-48 hours: Positive = Purulent conjunctivitis + eyelid swelling |
| Subcutaneous | 2-3 mL mallein SC in neck | Positive = Fever + local swelling + general reaction within 8-24 hrs |
| Intradermal | Small dose intradermal in neck skin | Swelling >35mm = positive |
C. SEROLOGICAL TESTS
| Test | Details |
|---|---|
| CFT (Complement Fixation Test) | Standard OIE prescribed test; most widely used; Official test for international trade |
| ELISA | More sensitive than CFT; good for screening |
| Rose Bengal Plate Test | Quick screening |
| Indirect Hemagglutination Test | Also used |
| Luminex bead-based test | Modern, high throughput |
D. BACTERIOLOGICAL CULTURE
- Sample: Nasal discharge, pus from nodules/ulcers
- Culture on Nutrient agar, MacConkey agar
- BSL-3 laboratory required (bahut dangerous organism hai - biosafety Level 3 chahiye)
- Confirmatory diagnosis
E. PCR
- Most sensitive and specific
- B. mallei-specific gene targets detect karta hai
- Quick result
F. DIFFERENTIAL DIAGNOSIS (Kya kya lagta hai par hai nahi)
| Disease | How to Differentiate |
|---|---|
| Strangles (Streptococcus equi) | Lymph node abscess, no nasal ulcers, mallein test negative |
| Melioidosis (B. pseudomallei) | Soil-borne organism, PCR differentiation |
| Epizootic Lymphangitis (Histoplasma farciminosum) | Fungal, slower progress, different culture result |
| Ulcerative Lymphangitis (Corynebacterium pseudotuberculosis) | Fetlock region mainly, different organism |
| Sporotrichosis | Fungal, no nasal involvement |
9. TREATMENT (Ilaaj)
Veterinary Treatment - IMPORTANT EXAM POINT ⭐
Horses mein treatment GENERALLY PROHIBITED AND CONTRAINDICATED hai!
- Zoonotic risk - infected horse ke paas rehna aur treat karna = human infection ka risk
- Treatment bacteriological cure reliably nahi deta
- Carrier state develop ho sakta hai - jo aur dangerous hai
- OIE and most countries ka protocol = CULL (euthanize) infected animals
Agar treatment karna hi pade (Research/Special cases)
| Drug | Route | Duration |
|---|---|---|
| Doxycycline | Oral | Long term (60-150 days) |
| TMP-SMX (Trimethoprim-Sulfadiazine) | Oral | Long term |
| Amoxicillin-Clavulanate | Oral | 60-150 days |
| Ciprofloxacin | - | Alternative |
| Streptomycin | - | Alternative |
| Meropenem | IV | Severe cases |
Human Treatment (Zoonosis mein)
- Same drugs as above
- Localized disease: TMP-SMX ya Doxycycline 60-150 days
- Severe/Septicemic: IV Imipenem/Meropenem + Doxycycline combination
10. CONTROL AND PREVENTION (Rokna kaise hai)
- Newly purchased animals
- Animals returning from travel
- Before equine events/shows
- Formalin 2% ya Phenol 5% ya Bleach effective hain
- B. mallei direct sunlight aur desiccation se bhi mar jaata hai
Vaccination
- Koi effective vaccine available NAHI hai presently
- Yeh ek major research gap hai (2025 review bhi yahi confirm karta hai - Torres AG, PLoS NTD 2025)
Movement Control
- Infected area se equid movement ban
- International import/export: CFT testing compulsory
11. ZOONOTIC IMPORTANCE (Insaanon ko kab hota hai)
- Risk group: Veterinarians, horse handlers, stable workers, slaughterhouse workers, laboratory personnel
- Entry route: Skin wounds/abrasions, nasal mucosa, eye, aerosol (lab mein)
- Human clinical forms: Localized cutaneous, pulmonary, chronic, septicemic
- Mortality: Untreated septicemic form mein 40-95% mortality
- Bioterrorism: B. mallei ko biological weapon ke roop mein World War I aur II mein use kiya gaya tha - officially bioterrorism agent listed hai
- PPE (gloves, mask, goggles) pehno infected animals handle karte waqt
- All samples BSL-3 lab mein process hon
- Any suspected human case immediately report karo
12. EPIDEMIOLOGY (Kahaan-Kahaan hai)
- India: Sporadic cases - notifiable disease under Prevention and Control of Infectious and Contagious Diseases in Animals Act 2009
- Endemic areas: Middle East (UAE, Bahrain), Pakistan, India, Brazil, Southeast Asia
- Eradicated areas: USA (last case 1934), Western Europe, Australia
- Reemerging: Bahrain, UAE mein recent outbreaks reported
13. EXAM KE LIYE KEY POINTS (High-Yield) ⭐⭐⭐
| Point | Answer |
|---|---|
| Causative agent | Burkholderia mallei |
| Gram stain | Gram-negative, non-motile bacillus |
| Most susceptible | Mule > Donkey > Horse |
| Horse mein form | Chronic / Farcy |
| Cutaneous form naam | FARCY |
| Skin nodules naam | Farcy buds |
| Thickened lymphatics naam | Farcy pipes |
| Most important diagnostic test | Mallein test (Intrapalpebral) |
| OIE prescribed serological test | CFT (Complement Fixation Test) |
| Treatment in horses | CONTRAINDICATED / PROHIBITED |
| Control method | Test and Cull |
| Vaccine available? | NO |
| Zoonosis? | YES - very dangerous |
| Bioterrorism potential? | YES |
| India mein status | Notifiable Disease |
| Differential for farcy | Epizootic lymphangitis, Ulcerative lymphangitis, Sporotrichosis |
| Stellate scars kahan banti hain | Nasal mucosa par (healed ulcers se) |
QUICK MEMORY TRICKS (Yaad karne ke tricks)
- "MALLEI = MULE KILLER" - Mules mein most fatal
- "FARCY = FAR from cure" - Chronic skin form, incurable in horses
- "No Vax, No Treat, Only Cull" - Glanders management mantra
- "B. mallei - NON-MOTILE" - Whereas B. pseudomallei MOTILE hai - difference yaad rakho
- "Mallein = Tuberculin of horses" - Same DTH principle, different organism
Recent Evidence: 2025 ka ek review (PMID: 40498787) confirm karta hai ki aaj bhi glanders ke liye koi approved vaccine ya definitive treatment nahi hai - yeh ek "ancient and emergent disease" hai. Aur 2025 mein ek paper (PMID: 41200364) glanders ka bioterrorism history cover karta hai jo exams mein zaroor poochha jaata hai.