In the United States, is a protozoan flagellate most common among those who travel to endemic areas, in homosexuals, and in child day care settings where constant diaper changing facilitates the spread from one child to another.

Question Options:

A. Amebiasis

B. Giardia

C. Cryptosporidiosis

D. Hepatitis

E. Cholera

GIARDIA.

Explanation: Giardia is a a protozoan flagellate that causes giardiasis. Giardiasis is an infectious diarrheal disease. They spread through water or by person-to-person contact. It is most common in areas with poor sanitation and unsafe water. It is also popularly known as beaver fever, it's symptoms might include watery diarrhoea alternating with greasy stools, fatigue, cramps etc.

Giardia

Explanation:

Giardia refers to infection which affect the intestine and it is caused by GIARDIA parasite. This disease can spread through food or water that are contaminated and can even occur when a person comes in contact with another person especially in dirty environments as well as poor water .

Some of the symptoms of giardiasis include

fatigue or tiredness, feeling nausea, diarrhea, loss of appetite and vomiting

The diarrheal illness is caused by microscopic parasites which is often found on surfaces, food, or water that has been contaminated with feces from infected person because the organism feeds off of another to survive.

In the United States Giardia infection is a common causes of waterborne disease and it also cause public health problems in most developing countries as well as some developed countries.