Rabies is fatal if the virus reaches which organ?

• A. The heart.
• B. The lungs.
• C. The brain.
• D. The kidneys.

Answer: (C)

Rabies is almost always fatal once the virus reaches the brain because it causes severe inflammation of the central nervous system (encephalitis), disrupting essential brain functions. After a bite, the virus travels from the site of infection along nerves toward the brain rather than spreading primarily through the bloodstream. In the brain, it replicates in neurons, leading to rapid neurological deterioration, seizures, paralysis, and ultimately death due to brain dysfunction and respiratory failure. Other organs like the heart, lungs, or kidneys aren’t the primary sites of fatal damage—the critical danger is the virus in the brain. This is also why prompt vaccination or post-exposure treatment, which prevent CNS entry, is crucial.