Which of the following is a waterborne viral infection associated with sewage?

The correct answer is polio, which is a waterborne viral infection associated with sewage. Polio, caused by the poliovirus, is primarily transmitted through the fecal-oral route. This means that the virus can spread through contaminated water, particularly in areas where sanitation is poor and sewage is not adequately treated or managed. When water becomes contaminated with fecal matter containing the virus, it can lead to outbreaks in communities, especially affecting children.

Typhoid fever, while also linked to contaminated water, is caused by a bacterial infection (Salmonella typhi) and not by a virus. Rubeola, or measles, is a viral infection that spreads through respiratory droplets and has no association with waterborne transmission. Hepatitis B is a viral infection but is primarily transmitted through blood and body fluids, not through water or sewage. This understanding of transmission routes helps clarify why polio stands out as the clear choice in the context of waterborne infections linked to sewage.