Which disease is NOT transmitted by water?

• A. AIDS
• B. Cholera
• C. Giardiasis
• D. Hepatitis A

Answer: (A)

This question tests how well you understand disease transmission routes, specifically which diseases are spread through water versus other pathways. AIDS, caused by HIV, is not transmitted by water. HIV transmission occurs through direct contact with certain body fluids—blood, semen, vaginal fluids, rectal mucus, breast milk—or from mother to child during birth or breastfeeding. Water does not carry the virus in typical environments.

Cholera is spread by water contaminated with Vibrio cholerae, often via drinking water in areas with poor sanitation. Giardiasis results from ingestion of Giardia cysts in contaminated water. Hepatitis A is mainly spread through the fecal-oral route and can be transmitted via contaminated water or food, especially where sanitation is lacking.

So the disease not transmitted by water is AIDS.