What is rabies

What is the Rabies Virus

Rabies is caused by the rabies virus, a single-stranded RNA virus that affects the central nervous system. The virus enters through breaks in the skin or mucous membranes and travels along nerve fibers to the brain and spinal cord, where it causes inflammation (encephalitis) that is typically fatal once symptoms develop. The virus has a long incubation period, which is why prompt post-exposure treatment is effective even after infection.

Transmission and Risk

Rabies is transmitted through direct contact with infected animal saliva, almost always via bites or scratches. Dogs are responsible for up to 99% of human rabies deaths globally, though bats, raccoons, foxes, and other wild animals also carry the virus. Person-to-person transmission is extremely rare, limited to organ transplantation and theoretical exposure to infected saliva. Most exposures occur when people don't recognize rabies risk and fail to seek treatment.

Symptoms and Progression

Rabies symptoms typically appear 1 to 3 months after exposure but can range from weeks to years. Initial symptoms include fever, tingling at the bite site, and behavioral changes. As the disease progresses, people experience hypersalivation, difficulty swallowing, agitation, muscle paralysis, confusion, and hallucinations. Hydrophobia (fear of water) is a classic symptom where patients experience painful throat spasms when attempting to drink. Once clinical symptoms appear, rabies is nearly always fatal, with death typically occurring within 7 to 10 days.

Prevention and Treatment

Post-exposure prophylaxis (PEP) is highly effective when given within 24 to 48 hours of potential exposure, and effectiveness decreases with delay. Treatment involves a series of rabies vaccinations and rabies immunoglobulin (RIG) to provide immediate protection. Prevention strategies include avoiding contact with wild animals, vaccinating pets, and seeking immediate medical attention after any animal bite. For people with occupational risk, pre-exposure prophylaxis vaccination is available and recommended.

Global Impact

Rabies kills approximately 59,000 people annually, making it one of the most lethal viral diseases. The burden is concentrated in Asia and Africa, where access to post-exposure prophylaxis is limited. India reports the highest number of deaths, followed by African countries. In developed nations with access to vaccination, rabies deaths are rare, but the disease remains a significant public health concern globally.