Syphilis is a bacterial sexually transmitted infection (STI).

Measles is caused by the measles virus, a highly contagious RNA virus.It spreads through the air when an infected person breathes, coughs, or sneezes. It can also spread through direct contact with secretions.

Cholera is a bacterial infection of the intestines caused by the bacterium Vibrio cholerae.

Typhoid fever is a bacterial infection that can be life-threatening if left untreated. It's caused by the Salmonella Typhi bacteria, which is related to the bacteria that cause salmonella food poisoning.