Give cause ,sign and symptoms, madical management , nursing management, diagnosis of chickenpox
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Chickenpox (Varicella) - Complete Clinical Overview
1. CAUSE (Etiology)
- Causative agent: Varicella-Zoster Virus (VZV), also called Human (alpha) Herpesvirus 3 - a member of the herpesvirus family.
- Primary infection with VZV causes chickenpox. After recovery, the virus establishes latent infection in cranial nerve ganglia and spinal dorsal root ganglia; reactivation later in life causes herpes zoster (shingles).
- Source of infection: A case of active chickenpox (virus present in oropharyngeal secretions and skin/mucosal lesions); rarely, a patient with herpes zoster.
- Scabs are not infective. Vesicular fluid is infectious for the first 3 days.
Mode of Transmission
- Primarily via respiratory droplets and droplet nuclei (airborne route).
- Direct contact with lesions.
- The virus can cross the placental barrier, causing congenital varicella.
- Secondary attack rate is approximately 85% in susceptible household contacts.
Incubation Period
- Usually 14-16 days (range: 10-21 days).
Period of Communicability
- From 1-2 days before the rash appears until 4-6 days after eruption (once all lesions have crusted, the patient is no longer infectious).
2. SIGNS AND SYMPTOMS
A. Pre-Eruptive (Prodromal) Stage - lasts ~24 hours (longer in adults: 2-3 days)
- Low to moderate fever
- Malaise and fatigue
- Headache
- Back pain and shivering
- In adults, prodrome is more pronounced
B. Eruptive Stage
The rash has four distinctive characteristics:
1. Distribution (Centripetal pattern)
- Begins on the trunk (most dense), then spreads to the face, scalp, and oral mucosa
- Arms and legs are less affected
- Axillae are affected; palms and soles are usually spared
- Mucosal surfaces (buccal, pharyngeal) are involved - painful oral ulcers
2. Rapid Evolution
The rash progresses quickly through stages: macule → papule → vesicle → pustule → crust
- Vesicles are delicate "teardrop" or "dew-drop" shaped on an erythematous base
- Scabs form 4-7 days after the rash appears
3. Pleomorphism (most characteristic feature)
- Lesions of all stages (macules, papules, vesicles, crusts) are present simultaneously in the same area
- This is because the rash appears in successive crops over 4-5 days
- This is a key clinical diagnostic clue
4. Fever pattern
- Fever does not run high but rises with each fresh crop of eruption
Rash Summary Table: Chickenpox vs Smallpox
| Feature | Chickenpox | Smallpox |
|---|---|---|
| Rash distribution | Centripetal (trunk > face/limbs) | Centrifugal (face/limbs > trunk) |
| Palms & soles | Rarely affected | Frequently affected |
| Rash stages at one time | Multiple (pleomorphic) | One stage at a time |
| Vesicle type | Superficial, unilocular | Deep, multilocular, umbilicated |
| Scab formation | 4-7 days after rash | 10-14 days after rash |
| Fever pattern | Rises with each crop | Subsides with rash onset |
(Park's Textbook of Preventive and Social Medicine)
3. DIAGNOSIS
A. Clinical Diagnosis (Primary)
The diagnosis of varicella is primarily clinical, based on:
- Characteristic history of exposure
- Typical pleomorphic vesicular rash with centripetal distribution
- Successive crops of lesions at different stages
B. Laboratory Diagnosis
| Test | Details |
|---|---|
| PCR (Polymerase Chain Reaction) | Gold standard - detects VZV DNA from vesicular fluid, crusts, saliva, CSF; highest sensitivity and specificity |
| Tzanck Smear | From a vesicle base - shows multinucleate giant cells (characteristic but not specific to VZV) |
| Direct Fluorescent Antibody (DFA) | Rapid test, can confirm and type the virus; lower sensitivity than PCR |
| Viral culture | Possible but VZV grows slowly and poorly - rarely indicated |
| Serum IgM antibody | Less sensitive than PCR; not the method of choice |
| Serum IgG antibody | Used to assess immunity/susceptibility in unvaccinated persons (e.g., healthcare workers) |
(Andrews' Diseases of the Skin; Park's Textbook of Preventive Medicine)
4. MEDICAL MANAGEMENT
A. Supportive Care (for uncomplicated cases in healthy children)
- Chickenpox in healthy children is usually self-limiting and requires symptomatic therapy only
- Antipyretics: Use paracetamol (acetaminophen) only
- ⚠️ ASPIRIN AND ALL SALICYLATES ARE ABSOLUTELY CONTRAINDICATED - they increase the risk of Reye syndrome (acute encephalopathy + fatty liver)
- Antipruritic measures: Topical calamine lotion, oatmeal baths; keep environment cool; light, loose clothing
- Encourage adequate fluid intake
- Keep fingernails short to prevent scratching and secondary infection
B. Antiviral Therapy
| Patient Group | Drug & Dose | Duration |
|---|---|---|
| Healthy children (routine) | Not routinely recommended; case-by-case basis | - |
| Children at high risk (skin conditions, CF, diabetes, immunosuppression, chronic steroid use) | Acyclovir 20 mg/kg/dose (max 800 mg), 4× daily | 5 days |
| Adolescents and adults (≥13 years) - all recommended | Acyclovir 800 mg, 4-5× daily | 5 days |
| Severe/fulminant disease, visceral complications | IV Acyclovir 10 mg/kg every 8 hours (adjust for renal function) | Until clinical improvement |
| Immunosuppressed patients | IV Acyclovir | As above |
- Valacyclovir and famciclovir are also effective alternatives to acyclovir.
- Therapy is most effective if started within 24 hours of rash appearance.
- Foscarnet is used if acyclovir resistance develops.
C. Treatment of Complications
| Complication | Management |
|---|---|
| Secondary bacterial infection (S. aureus, Group A Streptococcus) | Appropriate antibiotics |
| Varicella pneumonia | IV Acyclovir; oxygen therapy; mechanical ventilation if severe |
| Encephalitis/cerebellar ataxia | IV Acyclovir; supportive neurological care |
| Reye syndrome | Avoid aspirin; ICU supportive care |
| Purpura fulminans / DIC | Intensive care management |
D. Post-Exposure Prophylaxis
- Varicella-Zoster Immunoglobulin (VZIG) given within 72 hours of exposure for high-risk susceptible individuals:
- Immunosuppressed persons (malignancy, HIV/AIDS, organ transplants, high-dose steroids)
- Pregnant women
- Newborns and premature infants
- Persons with congenital immunodeficiency
- VZIG has no therapeutic value in established disease.
E. Vaccination
- Live attenuated varicella vaccine (Oka strain): Two-dose schedule recommended
- Single dose: 70-90% protection; two doses: >95% protection against severe disease
- First dose: 12-15 months; second dose: 4-6 years
- Post-exposure vaccination within 3 days of exposure can reduce symptomatic infection by ~two-thirds
- Contraindicated in immunocompromised individuals and pregnant women
(Andrews' Diseases of the Skin; Park's Textbook of Preventive Medicine; Goldman-Cecil Medicine)
5. NURSING MANAGEMENT
A. Isolation and Infection Control
- Institute airborne and contact precautions immediately
- Isolate the patient from susceptible individuals, especially immunocompromised patients, pregnant women, and newborns
- Isolate cases for approximately 6 days after onset of rash (until all lesions have crusted)
- If hospitalized, do not admit to wards with immunocompromised patients or pediatric wards
- Healthcare workers without immunity should wear N95 masks
B. Nursing Assessment
- Assess the rash: distribution, stages, number of lesions, signs of secondary infection (pus, cellulitis)
- Monitor vital signs (temperature, pulse, respiratory rate) - watch for pneumonia signs
- Assess level of consciousness (for neurological complications)
- Assess for respiratory symptoms (dyspnea, cough) - varicella pneumonia
- Assess hydration status and oral intake
- Assess pruritus severity and skin integrity
- Check vaccination and exposure history
C. Nursing Interventions
Skin Care:
- Apply calamine lotion or topical antipruritics to relieve itching
- Give oatmeal baths (tepid water) for itch relief
- Keep the patient's fingernails cut short and clean to prevent scratching
- Use loose, soft, cotton clothing to avoid friction
- Discourage scratching to prevent secondary bacterial infection and scarring
Fever Management:
- Administer paracetamol as prescribed for fever
- Tepid sponging for high fever
- Ensure adequate fluid intake
- Never administer aspirin or NSAIDs
Infection Prevention:
- Disinfect articles soiled by nose and throat discharges
- Proper hand hygiene by staff and caregivers
- Educate family about isolation measures and when the child can return to school (when all lesions crusted)
Nutritional Support:
- Encourage soft, bland foods if oral lesions are present (painful ulcers reduce oral intake)
- Maintain adequate hydration
Comfort and Rest:
- Provide a cool environment - heat increases lesion formation
- Ensure adequate rest
- Provide emotional support and reassurance to patient and family
Monitoring and Complication Watch:
- Watch for signs of secondary bacterial infection: increased redness, warmth, pus, fever spike
- Monitor for respiratory distress (pneumonia)
- Monitor for neurological changes: altered consciousness, ataxia, seizures (encephalitis)
- Watch for signs of severe vomiting with altered consciousness (Reye syndrome)
- Any child with severe vomiting must be urgently evaluated to exclude Reye syndrome
Patient and Family Education:
- Explain the contagious nature of the disease and isolation requirements
- Teach proper hand hygiene
- Emphasize that aspirin must never be given to children with chickenpox
- Advise about vaccination for siblings/contacts
- Explain signs of complications requiring immediate medical attention
- Reassure that most cases in healthy children are self-limiting
D. Documentation
- Rash progression (stage, distribution, number of crops)
- Temperature trends
- Medications administered and patient response
- Any complications identified
- Education provided to patient/family
Complications Summary
| System | Complication |
|---|---|
| Skin/Soft tissue | Secondary bacterial infection (most common), cellulitis, scarring |
| Respiratory | Varicella pneumonia (1 in 400 adults; rare in healthy children) |
| Neurological | Cerebellar ataxia, encephalitis, stroke (VZV vasculopathy) |
| Hepatic | Asymptomatic hepatitis; Reye syndrome (if aspirin used) |
| Hematological | Thrombocytopenia, purpura fulminans (DIC) |
| Cardiac | Asymptomatic myocarditis |
| Congenital | Congenital varicella syndrome (if infection before 20 weeks gestation): skin scars, limb atrophy, microcephaly, cataracts, chorioretinitis |
Sources:
- Andrews' Diseases of the Skin, Clinical Dermatology
- Park's Textbook of Preventive and Social Medicine
- Goldman-Cecil Medicine, International Edition
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