Micro GIT

A 53-year-old man is admitted to the hospital with severe dysentery. Other symptoms that he reports include nausea, vomiting, anorexia, headache, insomnia, muscle weakness, and weight loss. The patient states that he is a farmer, and that his illness has made it impossible for him to care for his crops and animals. He also mentions that most of his pigs are experiencing a diarrheal illness. Examination of a trichrome-stained stool specimen reveals the presence of trophozoites and cysts of a ciliated protozoan. Which one of the following parasites, all of which cause diarrheal illness, do you suspect?

A 24-year-old man visits the clinic complaining of persistent diarrhea, crampy abdominal pain, and foul-smelling flatulence. He has not had any fever or chills, but often feels nauseous after a meal. He states that the diarrhea has lasted for more than 2 weeks, and started about a week to 10 days after he returned from a backpacking trip high in the Colorado Rockies. When asked if he drank any stream or lake water on the trip, he replies, “Sure, all the time! That water sure is pure!” Perhaps the water is not as pure as he thinks! The laboratory reports the presence of trophozoites and cysts of a flagellated protozoan in his stool specimens. Which one of the following parasites, all of which cause diarrheal illness, do you suspect?

Pathogenesis of V. Cholerae involves one of the following second messengers:

Incubation period for Bacillus cereus food poisoning following consumption of contaminated food:

An immigrant from Bolivia complains of abdominal pain and cramping. Two months prior he passed numerous bloody stools. On examination he has right upper quadrant pain and hepatomegally. If this is a liver abscess, which of the following might have caused it?

A traveler developed diarrhea 2 weeks after returning from a trip to Moscow and St. Petersburg, Russia. The diarrhea has lasted for over 3 weeks and his stools are greasy and foulsmelling. Which of the following is the most probable etiologic agent?

Which of the following viruses cause gastroenteritis, especially in the winter, and have a star shape under electron microscopy?

A child was diagnosed with gastroenteritis and causative virus was shown to be enveloped. Which is the most likely virus?

Which of the following regarding Viral gastroenteritis is false?

Oral vaccine is available for

A man developed dipoplia and dysphagia after ingesting canned food. What is the most likely causative organism?

Pig-bel disease/Necrotizing enteritis is caused by

The bacteria that produces a shigella-like toxin is:

All of the following can cause dysentery, except?

Which of the following is mismatched?

The only cestode that can be transmitted from human to human is:

Stool examination is the usual initial diagnostic approach in all of the following, except:

Which of the following can multiply within the human host (autoinfection)?

A 21-year-old college student volunteered for a 2-year assignment as a missionary in a rural area of Central Mexico. Within 4 months of arrival, he developed a mild diarrheal illness with flatulence and abdominal discomfort that subsided spontaneously within a few weeks. Six months later, he noted progressive weight loss over several weeks, a low-grade fever, and right upper abdominal tenderness. He returned to the United States for medical consultation. The primary physical finding was an enlarged right lobe of the liver, which was tender on palpation. An ultrasound study confirmed the presence of an abscess at that site. Which of the following laboratory findings would be most likely to be helpful in supporting this patient’s diagnosis?

This question has 3 subsets of questions: A 45-year-old man has a routine physical in connection with a request for life insurance. All physical and laboratory examinations are normal except for a bilirubin of 2.6 mg/mL. The patient visited Nepal 1 year ago and acknowledged sharing intravenous drugs as a collegian. He has never had an acute hepatitis illness. What was the most likely cause of the man’s elevated bilirubin?

This question has 3 subsets of questions: A 45-year-old man has a routine physical in connection with a request for life insurance. All physical and laboratory examinations are normal except for a bilirubin of 2.6 mg/mL. The patient visited Nepal 1 year ago and acknowledged sharing intravenous drugs as a collegian. He has never had an acute hepatitis illness. Which laboratory test would be most likely to indicate the diagnosis?

This question has 3 subsets of questions: A 45-year-old man has a routine physical in connection with a request for life insurance. All physical and laboratory examinations are normal except for a bilirubin of 2.6 mg/mL. The patient visited Nepal 1 year ago and acknowledged sharing intravenous drugs as a collegian. He has never had an acute hepatitis illness. Which laboratory test is most useful for predicting response to treatment?