Question 1

Hepatitis A disease is caused by a DS RNA virus that is transmitted via contaminated blood products.

Accepted Answer

Hepatitis A is caused by a single-stranded RNA virus and is primarily transmitted through the fecal-oral route, not through contaminated blood products.

Question 2

What pathologies cause jaundice to develop in Hepatitis A infection?

Accepted Answer

Inflammation of the liver and decreased ability to metabolize bilirubin are both pathologies that can cause jaundice to develop in Hepatitis A infection.

Question 3

Which of the following protozoans causes bloody diarrhea?

Accepted Answer

Entamoeba histolytica is known to cause bloody diarrhea, a condition often referred to as amoebic dysentery. This protozoan invades the intestinal lining, leading to ulcers and bloody stools.

Question 4

Metronidazole is the treatment of choice for which protozoan diseases of the GI system?

Accepted Answer

Metronidazole is the treatment of choice for Giardiasis and Amoebiasis, both of which are protozoan diseases affecting the gastrointestinal system.

Question 5

Your patient presents with diarrhea, bloating, and cramping. They report drinking untreated river water on a camping trip. You lab notes oval cysts upon O & P examination. Flagellated protists are also observed.

Accepted Answer

Giardia lamblia is the correct answer because it is a flagellated protozoan parasite that causes giardiasis, characterized by symptoms such as diarrhea, bloating, and cramping. It is commonly transmitted through contaminated water, like untreated river water. The presence of oval cysts and flagellated protists in the lab findings supports the diagnosis of giardiasis caused by Giardia lamblia.

Question 6

Pinworms eggs are deposited into and transferred in feces.

Accepted Answer

The answer of Pinworms eggs are deposited into and transferred...

Question 7

Your patient presents with loose stools and abdominal cramps. They report eating a raw beef dish several weeks ago. O & P examination reveals proglottids in the feces. What is the probable infectious agent?

Accepted Answer

The presence of proglottids in the feces after consuming raw beef suggests an infection with Taenia saginata, the beef tapeworm.

Question 8

Which Nematode infection results from consumption of eggs contaminating the soil with resulting malnutrition, especially in children?

Accepted Answer

Ascariasis is caused by the ingestion of eggs from the soil, which can lead to malnutrition, especially in children, due to the worms consuming nutrients in the intestines.

Question 9

Hookworms have a complex life cycle that includes which one of the following activities?

Accepted Answer

Hookworms have a life cycle that involves the larval stage penetrating human skin, often through small cuts or abrasions, rather than through ingestion of eggs or the release of proglottids, which is characteristic of tapeworms. Humans are the definitive host, not an intermediate host, in the hookworm life cycle.

Question 10

Which of the listed activities is most likely to prevent hookworm infection?

Accepted Answer

Shoe wearing is the most effective listed method for preventing hookworm infection, as hookworm larvae typically infect humans by penetrating the skin of the feet from contaminated soil.

Quiz 20: Diseases of the Gastrointestinal System