Rabies

Rabies is a fatal infectious disease caused by viruses of the genus Lyssavirus that affects the central nervous system. acute is transmitted through the saliva of infected animals typically via bites and is nearly always fatal if untreated. Rabies is a serious public health concern for both humans and animals. Prevention is possible through prompt post-exposure intervention and effective management. Disease time fast people infection

Etiology and Epidemiology of Rabies

The rabies virus is an RNA virus belonging to the family Rhabdoviridae. Virus is transmitted through the saliva of infected animals via bites scratches or contact with open wounds. Infected animals may include dogs cats bats foxes jackals and raccoons. The virus reaches the central nervous system via peripheral nerves where it causes inflammation.

Rabies is a global disease but is particularly prevalent in Asia and Africa. Dog-mediated rabies is responsible for the majority of human rabies cases in these regions. In developed countries bats are the primary reservoir. Despite being preventable rabies causes thousands of human deaths worldwide each year.

Clinical Findings and Symptoms

Rabies is clinically divided into three stages: prodromal acute neurological and coma.

Prodromal Stage

This stage lasts 2 to 10 days before the onset of specific symptoms. Symptoms are nonspecific and may include:

• Fever
• Headache
• Malaise
• Anorexia
• Pain itching or tingling at the site of the bite

Acutely Neurological Stage

During this stage symptoms related to central nervous system involvement appear. Two distinct forms may occur:

Encephalitic (Furious) Rabies

Hyperactivity: Restlessness agitation and aggression.

• Hydrophobia: Fear of water and difficulty swallowing due to pharyngeal muscle spasms.
• Aerophobia: Extreme sensitivity to air currents.
• Neurological findings: Confusion hallucinations and seizures.

Paralytic (Dumb) Rabies

• Paralysis: Flaccid paralysis typically starting at the site of the bite and spreading.
• Coma: Rapidly progressive loss of consciousness.

Coma and Death

If untreated rabies rapidly progresses to coma and death. Death usually results from respiratory failure or cardiac arrest.

Diagnostic Methods

The diagnosis of rabies is based on clinical findings and laboratory tests. The following methods are used:

• Direct fluorescent antibody test (DFA): Detection of rabies virus antigens in brain tissue saliva or skin biopsy.
• Polymerase chain reaction (PCR): Detection of rabies virus RNA in saliva cerebrospinal fluid or tissues.
• Serological tests: Detection of antibodies against the rabies virus in blood.

Treatment Approaches

There is no effective treatment once clinical symptoms of rabies appear and the disease is nearly always fatal. Therefore prompt intervention after suspected exposure is critical.

Post-Exposure Prophylaxis (PEP)

• Wound care: Thorough washing of the bite or scratch wound with soap and copious water.
• Rabies immunoglobulin (RIG): Administered around the wound and intramuscularly to provide passive immunity.
• Rabies vaccine: Given in a total of five doses on days 0 3 7 14 and 28 after exposure to induce active immunity.

Supportive Care

Once clinical symptoms appear supportive care is provided:

• Intensive care: Respiratory and circulatory support.
• Symptomatic treatment: Control of pain agitation and seizures.

Prevention and Vaccination

The most effective way to prevent rabies is through vaccination of both humans and animals.

Vaccination in Humans

• Pre-exposure prophylaxis: Recommended for high-risk groups such as veterinarians and laboratory workers. Administered as three doses on days 0 7 and 21/28.
• Post-exposure prophylaxis: Administered following suspected rabies exposure.

Vaccination in Animals

• Vaccination of domestic animals: Regular vaccination of dogs and cats is critical to prevent the spread of rabies.
• Vaccination of wild animals: In some regions oral rabies vaccines are used for wildlife.