Rabies remains one of the oldest and most feared infections known to humankind.
Despite being entirely preventable, it continues to cause tens of thousands of deaths worldwide each year — mostly in Asia and Africa.
India alone accounts for nearly 36% of global rabies deaths, making awareness and preventive action absolutely vital.
This blog explores the transmission, management, and prevention of rabies in a clear and evidence-based manner.
Understanding Rabies:
Rabies is a viral zoonotic disease caused by the rabies virus, a member of the Lyssavirus genus in the Rhabdoviridae family.
The virus attacks the central nervous system (CNS) leading to inflammation of the brain (encephalitis) and ultimately death if untreated.
The disease affects all warm-blooded mammals, including humans, dogs, cats, cattle, and wildlife such as bats, raccoons, and foxes.
Transmission of Rabies:
Rabies is almost always transmitted through the bite, scratch, or lick of an infected animal, most commonly dogs in developing countries.
The virus is present in saliva, and once introduced through broken skin or mucous membranes, it travels along the peripheral nerves to reach the brain.
Common Modes of Transmission:
1. Animal Bites:
The most common route. The virus enters through the bite wound, replicating locally before
ascending nerves.
2. Scratches or Licks on Broken Skin:
Even a minor scratch or contact with saliva on abraded skin can transmit the virus.
3. Inhalation or Organ Transplant (Rare):
Documented in specific laboratory or transplant cases, but extremely rare.
4. Human-to-Human Transmission:
Practically unheard of, except in organ transplant cases.
High-Risk Animals:
Domestic dogs and cats (especially unvaccinated)
Wild animals: bats, raccoons, skunks, foxes
Livestock: cattle, goats, and camels (through bites from rabid dogs)
Global Reality:
In India, around 97% of human rabies cases result from dog bites.
Rural areas, where stray dog populations are high and access to post-exposure prophylaxis (PEP) is limited, face the greatest burden.
Pathophysiology: What Happens After a Bite
Once introduced, the rabies virus replicates locally in muscle tissue before entering peripheral nerves.
It travels through axonal transport to the spinal cord and brain — a journey that can take weeks to months depending on the site of the bite, viral load, and host immunity.
After reaching the brain, the virus causes fatal encephalitis, leading to the classic symptoms of rabies — hydrophobia (fear of water), aerophobia (fear of air), agitation, and paralysis.
Clinical Features of Rabies
The incubation period ranges from 10 days to 6 months (average: 1–3 months). The disease manifests in two main forms:
1. Furious (Classical) Rabies – 80% cases
– Hyperactivity and agitation
– Difficulty swallowing (hydrophobia)
– Fear of drafts or air (aerophobia)
– Hallucinations and confusion
– Intermittent periods of excitement and calm
– Death within 3–5 days after symptom onset
2. Paralytic (Dumb) Rabies – 20% cases
– Gradual paralysis beginning at the site of bite
– Flaccid weakness resembling Guillain–Barré syndrome
– Absence of hydrophobia
– Coma and death due to respiratory paralysis
Once clinical symptoms appear, rabies is almost universally fatal — which makes prevention and early management absolutely critical.
Management of Rabies Exposure
Step 1: Immediate Wound Care
Wash the wound immediately and thoroughly for at least 15 minutes using soap and running water.
Apply an antiseptic such as povidone-iodine, alcohol, or chlorhexidine.
Do NOT apply irritants like chili, lime, or turmeric — traditional remedies can worsen infection.
This step alone can reduce the risk of rabies by up to 90%.
Step 2: Post-Exposure Prophylaxis (PEP)
The cornerstone of rabies prevention after exposure is prompt PEP, which includes:
A. Wound Treatment
As above — immediate cleansing.
B. Vaccination
Modern cell-culture vaccines (CCVs) like Purified Vero Cell Vaccine (PVRV) or Purified
Chick Embryo Cell Vaccine (PCECV) are safe and effective.
Regimens:
1. Intramuscular (IM):
Essen schedule: 5 doses on Days 0, 3, 7, 14, and 28
Administered in the deltoid (or anterolateral thigh in children)
2. Intradermal (ID):
Updated Thai Red Cross (TRC) schedule: 2-site injections on Days 0, 3, 7, and 28
Economical and equally effective
C. Rabies Immunoglobulin (RIG)
For Category III exposures (severe bites, multiple wounds, or bites on face/neck):
Administer RIG as soon as possible, infiltrating around the wound.
Two types:
– Human RIG (HRIG): 20 IU/kg body weight
– Equine RIG (ERIG): 40 IU/kg body weight
If not available on Day 0, can be given within 7 days of starting vaccination.
Step 3: Supportive Care (for Symptomatic Cases)
Once rabies symptoms appear, no treatment is curative. Management focuses on:
– Sedation and pain control
– Mechanical ventilation
– Supportive ICU care
Milwaukee Protocol, involving induced coma and antiviral therapy, has shown inconsistent results and is not routinely recommended.
Pre-Exposure Prophylaxis (PrEP)
For people at high risk of exposure, PrEP offers protection before any bite occurs.
Indications:
– Veterinarians, animal handlers, lab personnel
– Dog catchers, wildlife officers, travelers to endemic zones
– Children in high-risk areas
Schedule:
Three doses on Days 0, 7, and 21 (or 28)
A booster after 1 year, then every 3–5 years depending on risk
In case of exposure, those already vaccinated need only two booster doses (Day 0 and 3) — no RIG required.
Categories of Exposure (WHO Classification)
Category
I
Type of Contact
Recommended Management
Touching or feeding animals, licks on intact skin No prophylaxis
II
III
Nibbling of uncovered skin, minor scratches Wound care + Vaccine
Single or multiple transdermal bites/scratches, licks on broken skin, contamination of mucosa Wound care + Vaccine + RIG
Prevention and Control of Rabies:
Rabies elimination is possible with a multipronged, “One Health” approach integrating human and animal health systems.
1. Mass Dog Vaccination
70% coverage in dogs is enough to interrupt transmission.
Annual community dog vaccination drives have dramatically reduced human rabies in
countries like Sri Lanka and Thailand.
2. Dog Population Management
Humane sterilization and vaccination programs for stray dogs.
Community awareness on responsible pet ownership.
3. Public Education
Encourage immediate wound washing and reporting bites.
Dispel myths around dog bites and traditional treatments.
School-based education programs for children.
4. Surveillance and Reporting
Strengthening national rabies surveillance systems.
Reporting animal bites and suspected rabies cases promptly.
5. Improved Vaccine Access
Availability of economical intradermal vaccine regimens in primary health centers.
Integration into Universal Immunization Program (UIP).
India’s National Action Plan for Rabies Elimination (NAPRE)
The NAPRE (2021–2030) aims for zero human deaths due to dog-mediated rabies by 2030,
in line with the WHO global strategy.
Key features include:
– Intersectoral coordination (Human Health + Animal Husbandry + Local Bodies)
– Mass dog vaccination
– Rabies awareness programs
– Strengthened laboratory capacity
– Take-Home Message
Rabies is 100% preventable but remains 100% fatal once symptoms develop.
The key lies in awareness, timely action, and mass vaccination — for both humans and animals.
No one should die from rabies in today’s world — not when the tools for prevention are already in our hands.
Quick Summary:
– Transmission: Bite, scratch, or lick from infected animals (especially dogs).
– Management: Immediate wound washing → Vaccination → Immunoglobulin (if needed).
– Prevention: Dog vaccination, human awareness, and pre-exposure prophylaxis for high-risk