Which of the following is NOT a waterborne disease?

Flu is not considered a waterborne disease because it is primarily transmitted through respiratory droplets when an infected person coughs or sneezes. Unlike typhoid, cholera, and hepatitis A, which are associated with ingestion of contaminated water, the flu is spread from person to person and can also be contracted by touching surfaces that have the virus on them.

Typhoid is caused by the bacterium Salmonella typhi and is typically spread through contaminated food and water. Cholera, caused by the bacterium Vibrio cholerae, is directly linked to drinking unclean water and can lead to severe dehydration. Hepatitis A, a viral infection, is also transmitted through the fecal-oral route, often associated with consuming contaminated water or food. The distinction between flu and waterborne diseases lies in the mode of transmission; hence, flu is not classified in the same category as those other diseases.