Decontamination of drinking water, fruits, and vegetables before consumption is necessary in countries without well-developed public sanitation. Which of the following diseases would probably be least affected by that kind of precaution?

A 48-year-old patient was admitted to the hospital after complaining of fever and shortness of breath. Radiographs revealed an enlarged heart and complete blood count smear results revealed rare C-shaped trypomastigote forms. The patient was an active military duty officer years ago in the Panama Canal zone (Central/South America). The most likely parasite is:

In what part of the avian digestive system does mechanical digestion occur?

Which of the following is a means of transmission for toxoplasmosis? Select all that apply.

A 40-year-old resident of Virginia presented to their physician with fever, muscle pain, periorbital edema, and eosinophilia. The case history revealed the patient had consumed locally produced pork sausage about 10 days previously. Which of the following diseases is the patient most likely suffering?

Because you are responsible for parasite control on an island, you chemically treat the small freshwater lake for snails, but you accidentally dump in too much chemical and kill every living thing in the lake. Your action breaks the life cycle and controls the spread of all of the following EXCEPT:

Which one of the following organisms does observation of the feces provide no useful means of diagnosis?

A 15-year-old patient was admitted with severe headache and confusion. An examination of their spinal fluid revealed many small, motile amoebae. The patient was visiting friends in Texas and had been swimming and diving in a freshwater pond. The most likely organism is:

Pertussis (whooping cough) is an epidemic disease that is a highly contagious, acute infection of the upper respiratory tract caused by the:

During the paroxysmal stage of pertussis, symptoms are: