Which of the following diseases can't be prevented by vaccination?
The correct answer is Option 3: Beri beri.
Explanation:
Beri beri is a nutritional deficiency disease, not an infectious disease caused by a pathogen (like a virus or bacterium). It is caused by a severe lack of vitamin B1 (thiamine) in the diet.
Because it is not caused by a germ, the immune system cannot be trained to fight it, meaning it cannot be prevented by a vaccine. Instead, it is prevented and treated by eating thiamine-rich foods (like whole grains, legumes, meat, and nuts) or taking vitamin supplements.
Why the other options are incorrect:
The other three options are all infectious diseases that have highly effective vaccines available:
Option 1: Rabies is a deadly viral disease transmitted through animal bites. It can be prevented by both pre-exposure and immediate post-exposure rabies vaccinations.
Option 2: Typhoid is a bacterial infection caused by Salmonella typhi. Typhoid vaccines (injectable or oral) are routinely given to people living in or traveling to high-risk areas.
Option 4: Measles is a highly contagious viral respiratory infection that is safely and effectively prevented globally by the MMR (Measles, Mumps, and Rubella) vaccine.
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