Infections caused by protozoa are relatively rare in the United States, but with people traveling throughout the world in increasing numbers, it is not unusual for a person to return home from travelling with a fully developed protozoal infection. What are some areas where protozoa infections are prevalent? Select all that apply.

Protozoan infections are most prevalent in Asia, Africa and South America.

Explanation:

Infections caused by protozoans in humans include severe diseases like African sleeping sickness, malaria, amoebic dysentery, giardiasis etc.

These infections are transmitted through arthropod vectors mostly through their bite. Protozoan parasitic infections are common in tropical developing countries than in the developed nations.

When travelers from non-prevalent countries like the United States travel to countries which are prone to protozoan infections, they also become susceptible and get infected when their own immune system is weakened. They become potential carriers when they travel back to their country.

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