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Chancroid

A clump of Haemophilus ducreyi bacteria found in a sample of rabbit blood Image: CDC/Dr. Greg Hammond

The infection: Chancroid is caused by the bacteria Haemophilus ducreyi. Very rarely seen in the U.S., with zero reported cases in 2020.

Symptoms and long-term effects: It can cause enlarged lymph nodes around the groin as well as painful and bleeding gential ulcers. If left untreated, the infection can be joined by other bacteria, raising the risk of widespread tissue damage and permanent scarring.

How to treat it: The infection is easily treatable with antibiotics.

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