Human rabies: a continuing challenge in the tropical world

Area of Science:

• Veterinary Medicine
• Infectious Diseases
• Public Health

Background:

• Rabies causes over 99% of human deaths globally in tropical developing nations.
• India faces 30,000-50,000 annual rabies fatalities, primarily from Lyssaviruses.
• Rabies is a zoonotic disease predominantly transmitted by dogs in Asia, Africa, and Latin America, and by wild carnivores elsewhere.

Purpose of the Study:

• To discuss the pathogenesis, clinical features, and diagnosis of rabies.
• To inform the planning of rabies control strategies by detailing disease distribution and incidence in animal reservoirs.
• To evaluate the suitability of different vaccination approaches for diverse geographical and epidemiological contexts.

Main Methods:

• Review of existing literature on rabies epidemiology, pathogenesis, and control.
• Analysis of rabies reservoir species and transmission dynamics in different global regions.
• Comparison of conventional canine vaccines, oral vaccines, and tissue culture vaccines.

Main Results:

• Rabies control requires tailored strategies based on local animal reservoirs (dogs vs. wild carnivores).
• Conventional canine vaccines are effective in urban settings with owned dogs.
• Oral vaccines in baits are suitable for stray dogs and wild reservoirs, while intradermal regimens with tissue culture vaccines are replacing older nervous tissue vaccines in developing countries.

Conclusions:

• Effective rabies control necessitates understanding the specific animal reservoirs and implementing context-appropriate vaccination strategies.
• Transitioning from outdated nervous tissue vaccines to modern tissue culture vaccines is crucial for improving rabies prevention in endemic regions.
• Integrated rabies prevention programs, considering both domestic and wild animal populations, are essential for reducing human mortality.