Typhoid fever, a water-borne disease, is caused by

Typhoid fever is caused by the bacterium Salmonella typhi.

Viruses cause water-borne diseases like hepatitis A and polio, not typhoid.

Protozoans cause illnesses such as amoebiasis and giardiasis.

Helminths are parasitic worms behind infections like schistosomiasis.

Typhoid spreads through water or food contaminated with faecal matter.

It is preventable by safe water, sanitation and vaccination.