Blood in stool is seen in all except –
Correct Answer: Vibrio cholera
Description: Ans. is 'a' i.e., Vibrio cholerae * Based on the depth of intestinal invasion, there are different clinical manifestations of infection with organisms causing diarrhea:1) No cell invesion (noninflammatory)# The bacteria bind to intestinal epithelial cells but do not enter the cell.# Diarrhea is caused by the release of enterotoxins.# Watery diarrhea with no fecal leukocytes and no systemic symptoms (e.g. fever) occurs.# Organisms are1. V. cholerae4. Clostridium perfringens7. Cryptosporidia10. Adenovirus2. ETEC5. B. cereus8. Microsporidia 3. Staph, aureus6. Giardia9. Rotavirus 2) Invasion of the intestinal epithelial cells (Inflammatory)# The organisms have virulence factors that allow binding and invasion into cells.# Toxins may be then released that destroy the cell.# The cell penetration results in a systemic immune response with fecal leukocytes as well as fever.# The cell death results in RBC leakage into the stool (dysentery).# Organisms are:-1. Shigella4. EHEC&EIEC7. C. difficale2. Salmonella Sp.5. Vibrio parahemolyticus8. E. histolytica3. Campylobactorjejuni6. Yersinia enterocolitica 3) Invasion of lymph nodes and blood stream (Penetrating)# Along with abdominal pain and diarrhea containing WBCs and RBCs, this deeper invasion results in systemic symptoms of fever, headache and leukocytosis.# Examples are - 1. Salmonella typhi, 2. Yersinia enterocolitica, and 3. Campylobacter jejuni.
Category:
Microbiology
Get More
Subject Mock Tests
Practice with over 200,000 questions from various medical subjects and improve your knowledge.
Attempt a mock test nowMock Exam
Take an exam with 100 random questions selected from all subjects to test your knowledge.
Coming SoonGet More
Subject Mock Tests
Try practicing mock tests with over 200,000 questions from various medical subjects.
Attempt a mock test now