Why cephridin is not used in case of parvo in dog
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I now have enough information to give a comprehensive answer. Let me also clarify the drug name — "cephridin" is likely cephradine (also spelled cefradine), a first-generation cephalosporin.
Why Cephradine (Cephridine) is Not Used in Canine Parvovirus
1. Parvovirus Already Causes Severe Bone Marrow Suppression
Canine parvovirus (CPV-2) preferentially destroys rapidly dividing cells, including:
- Hematopoietic progenitor cells in the bone marrow
- Crypt epithelial cells of the small intestine
- Lymphoid tissues (thymus, lymph nodes)
This results in profound neutropenia and lymphopenia — the hallmark hematological finding. Neutropenia is so severe that it is used as a prognostic marker: persistent severe neutropenia carries a poor prognosis.
2. Cephalosporins (Including Cephradine) Can Cause Additional Myelosuppression
Cephalosporins are known to cause immune-mediated cytopenias in dogs, including:
- Neutropenia (immune-mediated destruction of neutrophils)
- Thrombocytopenia
- Hemolytic anemia
The mechanism involves drug-induced antibody (IgG) formation against red cells, platelets, and neutrophils — demonstrated specifically in dogs treated with cephalosporins like cefazedone and cefonicid (PMID: 3394717). Bone marrow histology in these dogs showed hematopoietic hypoplasia and toxic changes.
In a dog already neutropenic from parvo, adding a drug that can further suppress bone marrow and destroy circulating neutrophils is dangerous and potentially fatal.
3. Spectrum Gap — Cephradine Lacks Gram-Negative Coverage
Cephradine is a 1st-generation cephalosporin with:
- Good gram-positive coverage
- Weak gram-negative coverage (poor against Escherichia coli, Klebsiella, Pseudomonas, etc.)
In parvo, the disrupted intestinal barrier allows bacterial translocation of enteric gram-negative organisms, leading to gram-negative septicemia and endotoxemia. A 1st-gen cephalosporin simply does not cover these pathogens adequately.
4. What Is Actually Used Instead
Current guidelines recommend:
| Severity | Antibiotic |
|---|---|
| Moderate PVE | Ampicillin 22 mg/kg IV q8h (gram-positive + anaerobic coverage) |
| Severe / marked neutropenia | Ampicillin + enrofloxacin (10–20 mg/kg IV q24h) or gentamicin (9–12 mg/kg IV/IM/SC q24h) for added gram-negative coverage |
| Alternative | Cefoxitin (a 2nd-gen cephalosporin) as a single agent |
Fluoroquinolones (enrofloxacin) provide excellent gram-negative coverage without the additional myelosuppressive risk of cephradine.
Summary
Cephradine is avoided in canine parvovirus because:
- It worsens neutropenia — cephalosporins cause immune-mediated bone marrow suppression and neutrophil destruction in dogs, compounding the already severe CPV-induced myelosuppression.
- Inadequate spectrum — as a 1st-generation agent, it fails to cover the gram-negative bacteria responsible for bacterial translocation sepsis in parvo.
- Risk outweighs benefit — safer, broader-spectrum alternatives (ampicillin ± enrofloxacin) are available that do not add hematologic toxicity.
Rodents toxicity in cat from different books
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Note: The medical textbook library does not contain veterinary-specific textbooks. The following is compiled from the best available veterinary references: Merck Veterinary Manual, Small Animal Toxicology (Murphy & Talcott), Osweiler's Toxicology, Today's Veterinary Practice / APCC, VetPrep, and peer-reviewed journal sources (JAVMA, Top Companion Anim Med), which represent the standard multi-book coverage for this topic.
Rodenticide Toxicity in Cats
Cats can be exposed directly (eating bait) or via relay toxicosis (eating a poisoned rodent). There are four major classes of rodenticide, each with a distinct mechanism, clinical picture, and treatment.
1. Anticoagulant Rodenticides
Agents
| Generation | Examples |
|---|---|
| 1st generation (require multiple feedings) | Warfarin, pindone, coumafuryl, coumachlor |
| Intermediate | Chlorophacinone, diphacinone |
| 2nd generation / "superwarfarins" (single feeding toxic) | Brodifacoum, bromadiolone, difenacoum, difethiolone |
Mechanism
Anticoagulants inhibit vitamin K epoxide reductase (VKOR), preventing regeneration of active vitamin K₁. Without vitamin K, the liver cannot synthesize coagulation factors I, II, VII, IX, and X. Clotting factors already in circulation are consumed over days before signs appear.
Half-lives in plasma:
- Warfarin: ~15 hours
- Diphacinone: ~5 days
- Bromadiolone: ~6 days
- Brodifacoum: detectable up to 24 days → requires the longest treatment
Clinical Signs
- Latent period: 3–7 days (clotting factors must first be depleted)
- Anemia, weakness, lethargy, pallor
- Internal bleeding — hemoabdomen, hemothorax, pericardial effusion (most common)
- External bleeding — epistaxis, bleeding gums, melena, hematuria, hyphema
- Dyspnea if hemothorax present
- Subcutaneous hematomas
Diagnosis
- Prolonged prothrombin time (PT) — most sensitive early marker
- PIVKA test (proteins induced by vitamin K absence)
- Known exposure history
Treatment
- Decontamination: Induce emesis if recent ingestion (<2 hours); activated charcoal
- Antidote: Vitamin K₁ (phytonadione) — not K₂ or K₃
- Dose: 2.5–5 mg/kg/day orally, divided BID, given with a fatty meal for best absorption
- 1st-generation exposure: treat for 2 weeks
- 2nd-generation (brodifacoum, bromadiolone): treat for 4–6 weeks
- Check PT 48–72 hours after last dose — if prolonged, continue for another week
- IV vitamin K₁ is contraindicated (risk of anaphylaxis)
- For symptomatic/bleeding patients: fresh whole blood or fresh frozen plasma (FFP) to replace clotting factors
- Thoracocentesis if hemothorax; oxygen support
Relay Toxicosis
Second-generation anticoagulants (brodifacoum) accumulate in rodent tissues. Cats that hunt and eat poisoned rodents can develop toxicity — more clinically relevant for cats than dogs since cats more often consume prey whole.
Prognosis
- Good to excellent if treated before signs develop
- Guarded to good once bleeding has begun, depending on severity
2. Bromethalin (Neurotoxic Rodenticide)
Mechanism
Bromethalin is rapidly absorbed and bioactivated to its active metabolite desmethylbromethalin (DMB). DMB uncouples oxidative phosphorylation in CNS mitochondria → ↓ ATP → failure of Na⁺/K⁺-ATPase pumps → osmotic imbalance → intramyelinic edema and cerebral edema → raised intracranial pressure.
Feline Sensitivity
Cats are extremely sensitive — LD₅₀ in cats is only 0.4–0.71 mg/kg, compared to 2.38–5.6 mg/kg in dogs. Clinical signs in cats begin at doses as low as 0.24 mg/kg.
Two Clinical Syndromes
| Syndrome | Dose | Onset | Signs |
|---|---|---|---|
| Convulsant (acute) | ≥ LD₅₀ | 4–36 hours | Severe tremors, hyperexcitability, seizures, hyperthermia, respiratory failure, death |
| Paralytic (subacute) | < LD₅₀ | 1–7 days | Hindlimb paresis/paralysis, ataxia, depression, inability to vocalize, ileus, abdominal distension |
Key fact for cats: Unlike dogs (which can show the convulsant form at high doses), cats almost always develop the paralytic syndrome regardless of dose. They may also develop ileus and abdominal distension.
Bromethalin undergoes enterohepatic recirculation — this is why multi-dose activated charcoal is more effective than a single dose.
Treatment
- No antidote
- Multi-dose activated charcoal (even hours after ingestion, due to enterohepatic recycling)
- Mannitol or hyperosmolar agents for cerebral edema (evidence limited)
- Anticonvulsants (diazepam, levetiracetam) for seizures
- Supportive care: padded bedding, frequent turning, nutritional support, IV fluids
- Prognosis: poor once severe paralysis or coma present; signs may take weeks to resolve
3. Cholecalciferol (Vitamin D₃)
Mechanism
Cholecalciferol is converted to 25-hydroxycholecalciferol and then to the active 1,25-dihydroxycholecalciferol (calcitriol) → massive hypercalcemia and hyperphosphatemia → metastatic calcification of kidneys, heart, blood vessels, and soft tissues → acute renal failure.
Note: Cats are considered more resistant than dogs to cholecalciferol, but are still significantly at risk. Baits contain 0.075% active ingredient (0.75 mg/kg of bait).
Clinical Signs (onset 18–36 hours)
- Polydipsia, polyuria (early AKI)
- Depression, anorexia, vomiting
- Cardiac arrhythmias (hypercalcemia → bradycardia, shortened QT)
- Muscle weakness
- Renal failure signs: uremia, oliguria/anuria in severe cases
Diagnosis
- Hypercalcemia — hallmark finding
- Elevated phosphorus, BUN, creatinine
- Urinalysis: isosthenuria, casts
Treatment
- No specific antidote
- IV saline (0.9% NaCl) — promotes calciuresis
- Furosemide — enhances urinary calcium excretion
- Prednisone/dexamethasone — reduces intestinal calcium absorption and promotes renal excretion
- Pamidronate (bisphosphonate) — inhibits osteoclastic bone resorption; most effective for persistent hypercalcemia
- Restrict dietary calcium and vitamin D
- Treat AKI: IV fluids, dialysis if severe
- Treatment duration: until calcium and phosphorus normalize (days to weeks of hospitalization)
4. Zinc Phosphide
Mechanism
Two mechanisms:
- Phosphine gas formation: In the acidic stomach, zinc phosphide converts to phosphine gas (PH₃) → inhaled or absorbed → noncardiogenic pulmonary edema, direct cellular toxicity
- Systemic absorption of intact zinc phosphide → hepatic and renal failure
Warning: Phosphine gas in vomitus is also toxic to humans — always induce emesis outdoors or in a well-ventilated area.
Clinical Signs (rapid onset)
- Severe vomiting, abdominal pain, garlic/acetylene odor on breath
- Dyspnea, pulmonary edema
- Cardiovascular collapse, hypotension
- Seizures, CNS depression
- Hepatic and renal failure in survivors
Treatment
- No antidote
- Emesis ONLY if < 15–30 min post-ingestion, OUTDOORS
- Activated charcoal (may bind some zinc phosphide)
- Antacids (to raise gastric pH and reduce phosphine generation)
- Supportive: IV fluids, oxygen, anticonvulsants
- Prognosis: guarded to poor with significant exposures
5. Relay Toxicosis Summary
| Rodenticide | Relay Toxicosis Risk in Cats |
|---|---|
| 2nd-gen anticoagulants (brodifacoum) | Clinically significant — accumulates in rodent tissue |
| Bromethalin | Possible but less documented |
| Cholecalciferol | Low (metabolized in rodent tissue) |
| Zinc phosphide | Very low (gas dissipates before ingestion) |
Comparison Table
| Feature | Anticoagulants | Bromethalin | Cholecalciferol | Zinc Phosphide |
|---|---|---|---|---|
| Mechanism | ↓ Vitamin K → coagulopathy | Uncouples OxPhos → cerebral edema | Hypercalcemia → AKI | Phosphine gas → pulmonary/liver toxicity |
| Onset of signs | 3–7 days | 4–36 hrs (acute) or 1–7 days (paralytic) | 18–36 hours | Minutes–hours |
| Feline sensitivity | Moderate | Extremely high (LD₅₀ 0.54 mg/kg) | More resistant than dogs | Moderate–high |
| Feline syndrome | Internal hemorrhage | Paralytic form (regardless of dose) | Hypercalcemia + AKI | GI + pulmonary + hepatic |
| Antidote | Vitamin K₁ ✓ | None | None | None |
| Relay toxicosis | Yes (brodifacoum) | Possible | Low | Very low |
| Treatment duration | 2–6 weeks | Supportive; weeks | Days–weeks | Supportive |
Key References:
- Merck Veterinary Manual — Rodenticide Poisoning in Animals (2025)
- Murphy & Talcott: Small Animal Toxicology, 3rd ed.
- Osweiler GD: Toxicology, Williams & Wilkins, 1996
- ASPCA Pro: Merola V. "Anticoagulant rodenticides: deadly for pests, dangerous for pets." Vet Med 2002
- Peterson ME. "Bromethalin." Top Companion Anim Med 2013 [PMID: 23796484]
- Groman RP. "Acute management of calcium disorders." Top Companion Anim Med 2012 [PMID: 23415385]
- JAVMA: "Clinical presentation and outcome of bromethalin toxicosis" (2026)
Tell me about the antiallergic used in dog and cat with their classes
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I now have comprehensive data from the Merck Veterinary Manual, AAHA 2023 Guidelines (Muller & Kirk's Small Animal Dermatology), Plumb's Veterinary Drug Handbook, and Lippincott Pharmacology. Let me compile the full answer.
Antiallergic Drugs Used in Dogs and Cats — By Class
Sources: Merck Veterinary Manual, 2023 AAHA Management of Allergic Skin Diseases Guidelines, Muller & Kirk's Small Animal Dermatology (7th ed.), Plumb's Veterinary Drug Handbook (9th ed.), Lippincott Illustrated Reviews: Pharmacology
CLASS 1: ANTIHISTAMINES (H1 Receptor Antagonists)
Antihistamines competitively block H1 receptors, preventing histamine from binding and triggering allergic symptoms (vasodilation, pruritus, bronchoconstriction, mucus secretion). They are more effective as prophylaxis than for treating active allergic episodes.
Important: Overall efficacy in dogs and cats is moderate and highly individual. A patient not responding to one antihistamine may respond to another — trial rotation is a recognized clinical approach.
First-Generation (Sedating) Antihistamines
Cross the blood-brain barrier → sedation, anticholinergic effects (dry mouth, urinary retention, tachycardia). Mainly hepatic metabolism.
Dogs
| Drug | Dose | Frequency | Notes |
|---|---|---|---|
| Diphenhydramine (Benadryl®) | 2–4 mg/kg PO/IM/SC | q8–12h | Most commonly used; oral bioavailability questionable |
| Hydroxyzine (Vistaril®) | 2 mg/kg PO | q12h | Converted to cetirizine in body; sedating |
| Chlorpheniramine | <20 kg: 4 mg/dog; >20 kg: 8 mg/dog or 0.25–0.5 mg/kg | q8h | Good anti-itch |
| Clemastine | 0.05–1 mg/kg PO/IV | q12h | Some evidence of efficacy in canine atopy |
| Cyproheptadine | 0.3–2 mg/kg PO | q12h | Also anti-serotonin; used for appetite stimulation |
| Trimeprazine | 1 mg/kg PO | q12h | Phenothiazine-antihistamine combination |
| Amitriptyline | 1–2 mg/kg PO | q12h | TCA with H1 antagonism; used for chronic pruritus |
Cats
| Drug | Dose (flat dose, NOT mg/kg) | Frequency | Notes |
|---|---|---|---|
| Chlorpheniramine | 2–4 mg/cat PO/IM/SC | q12h | First-choice antihistamine in cats |
| Diphenhydramine | 2–3 mg/kg PO | q12h | Less preferred; sedation |
| Hydroxyzine | 5–10 mg/cat | q12h | Sedating |
| Cyproheptadine | 2 mg/cat | q12h | Also used as appetite stimulant in cats |
| Clemastine | 0.68 mg/cat | q12h | |
| Amitriptyline | 2.5–7.5 mg/cat PO | q12h | For psychogenic pruritus, chronic allergic skin disease |
Second-Generation (Non-Sedating) Antihistamines
Do not significantly cross BBB → minimal sedation, no anticholinergic effects. Preferred for long-term use.
Dogs
| Drug | Dose | Frequency | Notes |
|---|---|---|---|
| Cetirizine (Zyrtec®) | 1–2 mg/kg or 10–20 mg/dog PO | q12–24h | Widely used; good tolerability |
| Loratadine (Claritin®) | 1 mg/kg PO | q12h (AAHA) or 0.5 mg/kg q24h | Avoid formulations with xylitol |
| Fexofenadine (Allegra®) | 2–5 mg/kg PO | q12–24h | Minimal sedation |
Cats
| Drug | Dose (flat dose) | Frequency | Notes |
|---|---|---|---|
| Cetirizine | 5–10 mg/cat | q24h | Preferred 2nd-gen in cats |
| Loratadine | 2.5–5 mg/cat | q24h | |
| Fexofenadine | 10–15 mg/cat (Merck) or 30–60 mg/cat (others) | q12–24h |
Contraindications (all antihistamines): Cardiac disease (anticholinergic → hypertension), glaucoma, urinary obstruction. 1st-gen overdose → CNS hyperexcitability, seizures, death.
CLASS 2: GLUCOCORTICOIDS (Corticosteroids)
The most potent and rapidly effective antiallergic drugs in veterinary medicine. They suppress multiple levels of the allergic cascade — reduce production of cytokines (IL-1, IL-2, IL-4, IL-5, TNF-α), inhibit phospholipase A2 (blocking prostaglandin and leukotriene synthesis), reduce mast cell degranulation, and suppress T-lymphocyte activation.
Common Agents
| Drug | Species | Route | Dose | Duration/Notes |
|---|---|---|---|---|
| Prednisolone | Dogs & Cats | PO, IM | 1–2 mg/kg/day (induction), taper to 0.5 mg/kg q48h | Preferred oral steroid; cats absorb prednisolone better than prednisone |
| Prednisone | Dogs | PO | 1–2 mg/kg/day | Cats: use prednisolone (cats poorly convert prednisone → prednisolone) |
| Dexamethasone | Dogs & Cats | PO, IM, IV | 0.1–0.2 mg/kg | Short-term acute allergy; 7× more potent than prednisolone; no mineralocorticoid activity |
| Triamcinolone | Dogs & Cats | IM, intralesional | 0.1–0.2 mg/kg IM | Intermediate-acting; used for seasonal allergy |
| Methylprednisolone acetate | Cats | IM (depot) | 10–20 mg/cat | Long-acting (4–6 weeks); "steroid shot" — commonly used in cats due to ease of dosing |
| Betamethasone | Dogs & Cats | Topical, IM | As formulated | Topical combinations (e.g., with antibiotics) for allergic otitis/dermatitis |
Side Effects (Species-Specific)
- Dogs: Polyuria/polydipsia (PU/PD), polyphagia, iatrogenic Cushing's syndrome (chronic use), increased susceptibility to infection, hepatopathy (steroid hepatopathy), muscle wasting, delayed wound healing
- Cats: More resistant to steroid side effects than dogs; but long-term risk includes diabetes mellitus, weight gain, muscle atrophy, heart disease (with high-dose long-term methylprednisolone acetate)
CLASS 3: CALCINEURIN INHIBITOR — Cyclosporine
Brand names: Atopica® (dogs and cats), Optimmune® (ophthalmic, dogs)
Mechanism
Inhibits calcineurin → blocks transcription of IL-2 and other T-helper cell cytokines → suppresses T-lymphocyte activation and IgE-mediated allergic inflammation. Unlike steroids, has no effect on the HPA axis.
| Species | Dose | Frequency | Onset | Notes |
|---|---|---|---|---|
| Dogs | 5 mg/kg PO | q24h initially; reduce to q48–72h once controlled | 4–8 weeks for full effect | Give on empty stomach for best absorption |
| Cats | 5–7.5 mg/kg PO | q24h (may reduce) | 4–8 weeks | Available as oral solution; used for feline atopic skin syndrome, eosinophilic granuloma complex |
Side Effects
- Vomiting, diarrhea (most common, transient)
- Gingival hyperplasia (dogs)
- Increased susceptibility to infections (Toxoplasma in cats — screen and counsel)
- Cats: Risk of fatal toxoplasmosis if seronegative and hunting; avoid or test before use
- Avoid concurrent ketoconazole (increases cyclosporine levels via CYP3A4 inhibition)
CLASS 4: JAK INHIBITOR — Oclacitinib
Brand name: Apoquel® (dogs; off-label in cats)
Mechanism
Selectively inhibits Janus Kinase 1 (JAK1) and JAK3 → blocks intracellular signaling of itch-and-inflammation-driving cytokines (IL-4, IL-13, IL-31, IL-2). IL-31 is the major "itch cytokine."
| Species | Dose | Frequency | Onset | Notes |
|---|---|---|---|---|
| Dogs | 0.4–0.6 mg/kg PO | q12h × 14 days (induction), then q24h maintenance | Within 4 hours | Approved ≥12 months of age |
| Cats | Off-label (being explored) | — | — | Not FDA-approved for cats |
Key Advantages
- Rapid onset (comparable to corticosteroids)
- Effective for both acute flares AND long-term management
- No HPA axis suppression
Side Effects / Contraindications
- Increased risk of infections (bacterial skin, urinary tract, demodectic mange)
- Do not use in dogs <12 months, breeding/pregnant animals, or immunocompromised dogs
- Avoid in dogs with serious infections or neoplastic disease
- Monitor for papillomatosis with long-term use
CLASS 5: BIOLOGIC / MONOCLONAL ANTIBODY — Lokivetmab
Brand name: Cytopoint® (dogs only)
Mechanism
Caninized monoclonal antibody that specifically binds and neutralizes canine interleukin-31 (IL-31) — the primary cytokine responsible for the sensation of itch in allergic/atopic dogs. Highly targeted, does not suppress the entire immune system.
| Species | Dose | Route | Frequency | Onset |
|---|---|---|---|---|
| Dogs | 1–2 mg/kg SC | Subcutaneous injection | Every 4–8 weeks (individualized) | Within 24 hours |
| Cats | Not approved | — | — | Under investigation |
Key Advantages
- Single injection → weeks of itch relief
- No systemic immunosuppression
- Safe to combine with antihistamines, NSAIDs, antibiotics, vaccines
- No hepatic/renal metabolism concerns
CLASS 6: ALLERGEN-SPECIFIC IMMUNOTHERAPY (ASIT)
Not a drug class per se, but the only disease-modifying treatment for allergic disease.
- Subcutaneous immunotherapy (SCIT) — traditional "allergy shots"; monthly injections
- Sublingual immunotherapy (SLIT) — oral drops/sprays; newer option
Works by inducing immune tolerance via T-regulatory cell expansion and IgG4 "blocking antibody" production. Response time: 6–12 months. Best for environmental/atopic allergies. Used in both dogs and cats.
CLASS 7: MAST CELL STABILIZERS
Sodium Cromoglycate (Cromolyn)
- Stabilizes mast cell membranes → prevents degranulation → blocks histamine, leukotrienes, prostaglandin release
- Used topically (ophthalmic, nasal) in dogs and cats for allergic conjunctivitis and rhinitis
- Must be used before allergen exposure (preventive only)
CLASS 8: ESSENTIAL FATTY ACIDS (EFAs) — Adjuncts
Omega-3 (EPA/DHA) and Omega-6 fatty acid supplementation:
- Modify prostaglandin and leukotriene synthesis via competing with arachidonic acid
- Reduce skin inflammation; improve skin barrier function
- Used as adjuncts to reduce steroid requirements; modest anti-pruritic effect alone
- Safe for long-term use in both dogs and cats
Summary Comparison Table
| Class | Example Drugs | Species | Onset | Mechanism | Approved |
|---|---|---|---|---|---|
| 1st-gen antihistamines | Diphenhydramine, Chlorpheniramine, Hydroxyzine | D & C | Hours | H1 block | Yes (human drugs used off-label) |
| 2nd-gen antihistamines | Cetirizine, Loratadine, Fexofenadine | D & C | Hours | H1 block (non-sedating) | Off-label |
| Glucocorticoids | Prednisolone, Dexamethasone, Triamcinolone | D & C | Hours–days | Broad immunosuppression | Yes |
| Calcineurin inhibitor | Cyclosporine (Atopica®) | D & C | 4–8 weeks | Inhibits T-cell IL-2 | Yes (dogs + cats) |
| JAK inhibitor | Oclacitinib (Apoquel®) | Dogs (cats off-label) | 4 hours | JAK1/3 block → ↓ IL-31, IL-4 | Dogs only |
| Anti-IL-31 mAb | Lokivetmab (Cytopoint®) | Dogs | 24 hours | Neutralizes IL-31 | Dogs only |
| ASIT | Allergen extracts | D & C | 6–12 months | Immune tolerance | Yes |
| Mast cell stabilizers | Sodium cromoglycate | D & C | Preventive | Mast cell stabilization | Topical only |
| EFAs | Omega-3/6 supplements | D & C | Weeks | Alter eicosanoid synthesis | OTC adjunct |
References: Merck Veterinary Manual (2025) • 2023 AAHA Management of Allergic Skin Diseases in Dogs and Cats Guidelines • Muller & Kirk's Small Animal Dermatology, 7th ed. • Plumb's Veterinary Drug Handbook, 9th ed. • Lippincott Illustrated Reviews: Pharmacology • Peterson ME, Top Companion Anim Med 2013 [PMID: 23796484]
Explain the Chronic kidney disease in dog and cat in detail with all the references
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