Rabies Post-Exposure Prophylaxis (PEP)

Overview

Step 1 - WHO Exposure Category & PEP Decision

• The biting mammal is a known rabies reservoir/vector
• The animal appears sick or behaves abnormally
• A wound or mucous membrane was contaminated by saliva
• The bite was unprovoked
• The animal was unvaccinated or cannot be traced

Step 2 - Local Wound Treatment

1. Cleansing - Immediately flush and wash all wounds with soap and water under a running tap for at least 15 minutes. For puncture wounds, use a catheter for irrigation. If no soap, flush with plenty of water.
2. Chemical treatment - After cleansing, apply a virucidal agent: alcohol (400-700 ml/litre), tincture or 0.01% aqueous iodine, or povidone-iodine.
3. Suturing - Do NOT suture bite wounds immediately. If suturing is unavoidable, wait 24-48 hours using minimum stitches, under cover of local RIG infiltration.
4. Antibiotics & anti-tetanus - Give as indicated.

Step 3 - Vaccines (Active Immunization)

Type of Vaccines

• Human diploid cell vaccine (HDCV)
• Purified chick embryo cell vaccine (PCECV)
• Vero cell (purified Vero cell rabies vaccine - PVRV)
• Primary chick embryo cells, hamster kidney cells, duck egg vaccines

Intramuscular (IM) Schedules

(i) Essen Regimen - 5-dose schedule

(ii) Zagreb (Abbreviated Multisite) Regimen - 4-dose (2-1-1) schedule

(iii) Simplified 4-dose IM schedule

Intradermal (ID) Schedule

• Inject 0.1 ml at 2 sites on Days 0, 3, 7, and 28 (Day 14 is skipped)
• 1 ID dose = 1/5 of the IM dose (0.1 ml per site)
• Requires national health authority endorsement

Step 4 - Rabies Immunoglobulin (RIG) - Passive Immunization

• Administer only once, on Day 0 (simultaneously with the first vaccine dose), or as soon as possible after
• NOT indicated beyond Day 7 after first vaccine dose (active antibody response presumed to have begun)
• Inject as much as anatomically possible directly into and around the wound site(s); remaining dose goes IM at a site distant from the vaccine injection site
• RIG may be diluted in saline if needed to infiltrate multiple wounds
• Equine RIG is cheaper but carries a small risk of anaphylaxis (~1/45,000). No skin testing needed - it does not predict reactions. Be prepared to manage anaphylaxis.
• No skin testing before ERIG - it should be given regardless

Previously Vaccinated Individuals

• Only 2 doses IM on Days 0 and 3 are needed (or 4-site ID on a single visit)
• RIG is NOT indicated in these patients

Immunocompromised Individuals (incl. HIV/AIDS)

• Full 5-dose IM CCEEV series required (not the abbreviated schedules)
• Comprehensive wound management
• RIG must be given for Category II and III exposures
• Check rabies-virus neutralizing antibody titre 2-4 weeks after vaccination; give an additional dose if response is inadequate

Special Considerations

• No contraindications to PEP after high-risk exposure - this applies to infants, pregnant women, and anyone else
• No delay is permissible - start PEP immediately
• Local wound treatment remains effective even if started hours or days late (though immediate treatment is best)
• In developing countries, vaccination status of the animal alone should not be used as grounds to withhold PEP

Recent evidence note: A 2026 meta-analysis (PMID: 41997000) examined factors influencing rabies vaccine immunogenicity during PEP, which may update specific dosing considerations - the core WHO PEP framework above remains current.

Latest Clinical Guidelines for Rabies PEP (CDC & WHO, 2025-2026)

CDC / ACIP Guidelines (Updated July 15, 2025)

Standard PEP (Previously Unvaccinated)

Key 2025 update: The standard regimen for healthy, immunocompetent individuals in the US is now a 4-dose schedule (Days 0, 3, 7, 14) - not the older 5-dose Essen schedule. The 5th dose on Day 28 is reserved for immunocompromised patients.

Immunocompromised / Immunosuppressed Patients

• Use the 5-dose regimen: Days 0, 3, 7, 14, and 28
• HRIG is still required
• Avoid immunosuppressive agents during PEP unless essential
• After completing the series, test for rabies virus neutralizing antibody (RVNA)
• Advise patients that immune response may be inadequate

Previously Vaccinated Individuals

• No HRIG required
• Only 2 doses of vaccine IM on Days 0 and 3
• Applies to those who completed prior ACIP-recommended PrEP or PEP

HRIG - Key Rules (CDC 2025)

Practical Pitfalls (CDC 2025 Guidance)

• If HRIG and vaccine were inadvertently given at the same site: re-administer vaccine at a distant site; may re-administer HRIG if total dose does not exceed 40 IU/kg
• If the PEP schedule is delayed: maintain recommended spacing for subsequent doses; delays of a few days are acceptable but lapses of weeks may have unpredictable consequences
• Mild adverse reactions: do NOT interrupt PEP; manage with ibuprofen or acetaminophen

WHO Guidelines (2018 Position Paper - Current as of 2025)

WHO Exposure Categories (Unchanged)

WHO-Recommended Vaccine Schedules

• Essen (5-dose): Days 0, 3, 7, 14, 28
• Zagreb (2-1-1): 2 doses Day 0 (one each deltoid), then Day 7, Day 21
• Simplified 4-dose: Days 0, 3, 7, 14 (for immunocompetent patients with quality wound care + RIG)

Key WHO update: WHO promotes intradermal (ID) administration as the preferred route in endemic settings. It is equally safe and efficacious while using 60-80% less vaccine volume and requiring only 1-2 vials for a full course vs. 4-5 vials IM.

• Previously vaccinated: 1-site ID 0.1 ml on Days 0 and 3 only (no RIG)

WHO RIG Recommendations

• Give RIG only once, Day 0 (up to Day 7 if missed)
• Infiltrate all of it directly into/around the wound; remainder IM at distant site from vaccine

CDC vs. WHO: Key Differences at a Glance

Latest Evidence (2026 Meta-Analysis)

• Seroconversion rate by Day 14: 98% across all vaccines - not affected by vaccine type, route (IM vs. ID), or RIG use
• All three vaccines provide equivalent protection regardless of route of administration
• Supports WHO's position that ID and IM routes are interchangeable

Rabies PEP Schedules Followed in India (Current, 2024-2025)

Regulatory Framework

• NCDC (National Centre for Disease Control) National Guidelines for Rabies Prophylaxis - last revised 2019, updated in line with WHO TRS1012 (2018)
• NCDC Operational Guidelines - "Rabies Free City Initiative" - published September 25, 2024 under the National Rabies Control Programme (NRCP)
• APCRI (Association for Prevention and Control of Rabies in India) consensus guidelines
• Drug Controller General of India (DCGI) approved intradermal route in 2006

Step 1 - Wound Care (Same as WHO)

Step 2 - WHO Exposure Categories (Used in India)

Step 3 - India's Preferred PEP Vaccine Schedule

The "Updated Thai Red Cross (TRC)" Intradermal Schedule - India's Standard

• Total vaccine used: <2 vials vs. 5 vials for IM Essen
• Each 0.1 ml ID = 1/5 of an IM dose
• Injected into the deltoid or anterolateral thigh (intradermal, not subcutaneous)
• Advantages: 60-80% dose saving, lower cost, better compliance reported (77% vs. 60% for IM)

Important note: India has NOT yet adopted WHO's 1-week shortened ID schedule (Days 0, 3, 7 only). The Government of India is awaiting Indian-specific evidence before endorsing this change. The 4-week schedule (Days 0, 3, 7, 28) remains the official standard in India as of 2025.

Intramuscular (IM) Alternative - Essen Regimen

• Total: 5 vials, 5 visits
• Do NOT inject in the gluteal region

Step 4 - Rabies Immunoglobulin (RIG) in India

• RIG is administered at the wound site only (changed from earlier practice of giving remainder IM at a distant site)
• This reduces RIG wastage without compromising efficacy
• Give on Day 0 only; not beyond Day 7
• No skin test before equine RIG (does not predict reactions)
• Be prepared for anaphylaxis management

Step 5 - Previously Vaccinated Individuals

Special Populations in India

India vs. WHO: Key Difference in 2025

Available Vaccines in India

Key Takeaway

Correction on RIG Administration in India

What the Official NCDC Guidelines Actually Say

"As much of the calculated dose of RIG as is anatomically feasible should be infiltrated into and around the wound/s... After all the wound/s has been infiltrated, if any volume of RIG is remaining, it should be administered by deep intramuscular injection at a site distant from the vaccine injection site."

Where My Previous Claim Came From

"Rabies immunoglobulin is now administered at the site of wound only, reducing its wastage without compromising the efficacy."

Current Standard RIG Protocol in India (NCDC/APCRI)

Bottom Line

Rabies PEP Schedules in India - Current Guidelines (2024-2025)

Regulatory Framework

• NCDC National Guidelines for Rabies Prophylaxis - revised 2019, aligned with WHO TRS1012 (2018)
• NCDC Operational Guidelines - "Rabies Free City Initiative" - published September 25, 2024 under the National Rabies Control Programme (NRCP)
• APCRI (Association for Prevention and Control of Rabies in India) consensus guidelines
• DCGI approved intradermal route in 2006

Step 1 - Wound Care

Step 2 - WHO Exposure Categories (Used in India)

Step 3 - Vaccine Schedules

India's Standard: Updated TRC 2-Site Intradermal (ID) Schedule

• Total vaccine needed: <2 vials (vs. 5 vials for IM Essen)
• Inject strictly intradermal (not subcutaneous) - a visible bleb must form
• Use deltoid or anterolateral thigh

Important: India has NOT yet adopted WHO's 1-week ID schedule (Days 0, 3, 7 only). The Government of India is awaiting Indian-specific evidence. The 4-week, 4-visit schedule remains the official national standard as of 2025. Note: Himachal Pradesh has trialled the 1-week schedule at pooling centres, but this is not a national policy.

Alternative: Essen Intramuscular (IM) Schedule

• Total: 5 vials, 5 visits
• Never inject in the gluteal region (fat delays absorption, impairs seroconversion)

Step 4 - Rabies Immunoglobulin (RIG) - Category III Only

Products Available in India

RIG Administration Protocol (NCDC / APCRI Standard)

1. Bring RIG to room temperature (25-30°C) before administration
2. Infiltrate as much of the calculated dose as anatomically feasible into and around all wounds
3. Avoid multiple needle pricks into the same wound
4. If any volume remains after wound infiltration - administer by deep IM injection at a site distant from the vaccine injection site
5. RIG may be diluted with normal saline to ensure adequate volume for large or multiple wounds
6. Never administer RIG in the same syringe or same anatomical site as the vaccine
7. RIG is given only once, on Day 0; not beyond Day 7 after the first vaccine dose
8. Keep patient under observation for at least 30 minutes after ERIG administration (anaphylaxis risk)
9. No skin test before ERIG - it does not predict reactions and should not delay administration; have anaphylaxis management ready

Step 5 - Previously Vaccinated Individuals

Vaccination cards are essential for making this determination. If prior vaccination cannot be documented, treat as unvaccinated.

Step 6 - Special Populations

Available Vaccines in India

• All must have WHO potency ≥2.5 IU per IM dose
• Store at 2-8°C, protected from sunlight
• Use within 6-8 hours of reconstitution
• Switching between vaccine products or routes mid-course is acceptable if unavoidable

India vs. WHO - Key Difference in 2025

Re-exposure During an Ongoing PEP Course - What Happens?

Short Answer

The Key Principle

1. The new wound receives proper local treatment and RIG
2. The existing vaccine course continues uninterrupted

Scenario: Bitten Today (Day 0), Bitten Again Tomorrow (Day 1)

Why? On Day 1, the person has received only one vaccine dose - active immunity has not yet developed. RIG is still indicated (within the Day 0-7 window) for the new wound. The vaccine schedule already in progress will cover both exposures.

The 3-Month Rule (WHO / NCDC)

What Exactly Should Be Done in Your Scenario (Day 0 PEP, Bitten on Day 1)

What if RIG Was Already Given on Day 0 at Maximum Dose?

• If the full weight-based RIG dose was already given and infiltrated on Day 0, you cannot give more RIG (excess RIG suppresses the vaccine-induced antibody response)
• In this case, only wound care is performed for the new bite
• The ongoing vaccine course provides the protection - by Day 3-7, some active immunity is already developing

Summary

Day 0:  Bitten → Full PEP started (Vaccine Day 0 + RIG for Cat III)
Day 1:  Bitten again
        ↓
        Wound care for new bite ✓
        RIG to new wound only (if within Day 7 window & dose not exceeded) ✓
        NO new vaccine dose ✓
        Continue existing PEP schedule (Day 3, 7, 28) ✓

The "3-Month Rule" - What It Actually Is

Honest Clarification First

What the Underlying Principle Actually Is

For re-exposed patients who can document previous complete PrEP or PEP with a CCEEV, a shortened re-exposure regimen applies - 2 doses on Days 0 and 3 only, no RIG.

The Actual Framework for Re-exposure

Where Does "3 Months" Come From?

1. Bangladesh National Guidelines (citing it as a WHO recommendation) - no new PEP if re-bitten within 3 months of a complete course
2. Some regional/state health authority guidelines (e.g., New York State mentions exposures >3 months ago being managed case-by-case for low-risk animals)
3. It reflects the practical understanding that immunological memory from a completed cell-culture vaccine course is robust within the first few months, when neutralizing antibody titres are reliably above the protective threshold of 0.5 IU/ml

The Correct Clinical Decision Tree for Re-exposure

Re-exposed to suspected rabid animal?
            ↓
Wound care always first (wash ≥15 min)
            ↓
Can document previous complete PEP/PrEP
with a cell-culture vaccine?
    ↓               ↓
   YES              NO
    ↓               ↓
2 doses          Full PEP
Days 0 & 3       (vaccine +
No RIG           RIG for Cat III)

Bottom Line

• Documented complete prior vaccination → shortened re-exposure regimen (Days 0 & 3, no RIG), regardless of time elapsed
• Undocumented or incomplete prior vaccination → treat as unvaccinated, full PEP
• The vaccination card is therefore the single most important document a patient should retain after completing PEP

Animal Bites in India - When is Rabies PEP NOT Required?

Animals for Which PEP is Generally NOT Required in India

1. Domestic Rodents, Squirrels, Hares & Rabbits

"Exposure to domestic rodents, squirrel, hare and rabbits do not ordinarily require PEP." - NCDC Guidelines

• Includes: house rats, mice, squirrels, rabbits, hares, bandicoots
• Rationale: Rodents are not primary hosts of rabies virus and do not play a role in its transmission or maintenance in India
• Very few examples of rabies virus infection have ever been observed in Indian rodents
• Exception: Bites by wild rats/rodents in unusual circumstances - consult an infectious disease physician; PEP may be considered on a case-by-case basis

2. Bats

"Bat rabies has not been conclusively proved in India and hence, at present, exposure to bats does not warrant PEP." - NCDC Guidelines

• Only one reported case of bat-transmitted rabies in India (1954); none since
• Lyssaviruses have been detected in bats globally, but not confirmed in Indian bats
• Exception: Bat bites in unusual circumstances may be considered for PEP after expert consultation
• This is a major difference from Western guidelines (CDC/WHO globally strongly recommend PEP for all bat exposures)

3. Birds

• Birds are not known to transmit rabies - they are not mammals and do not carry rabies virus
• Bird bites/scratches do not require rabies PEP

4. Category I Exposures from ANY Animal

• Touching or feeding animals, licks on intact skin - no PEP regardless of species

5. Consumption of Cooked Meat of a Rabid Animal

• Cooking kills the rabies virus - no PEP required
• Raw meat from a rabid animal - PEP is warranted

6. Drinking Milk of a Rabid Animal

• No documented cases of transmission through milk
• No PEP required (though boiling milk is always recommended as routine practice)

7. Contact with Rabies Patient (Human)

• PEP is not recommended for persons who had contact with a rabies patient
• Exception only: Direct exposure to saliva or organs of a rabid person (e.g., organ transplant, deep bite from patient) - PEP may be considered in these special circumstances

Animals for Which PEP IS Always Required in India

Key rule from NCDC: "Bite by all wild animals should be treated as Category III exposure. All animal bites in forest or in the wild should be treated as Category III exposure."

Summary Table

Important Caveat

"Rabies does not give a second chance as it is 100% fatal once disease occurs. Hence, it is better to over-treat rather than under-treat animal bite cases."