Minimum number of mycobacteria required to be detected by AFB staining is (per ml):
Correct Answer: 10,000
Description: A presumptive diagnosis is commonly based on the finding of AFB on microscopic examination of a diagnostic specimen. At least 10,000 acid fast bacilli should be present per ml of sputum to be readily demonstrable in direct smears. A negative repo should not be considered till at least 300 fields have been examined, taking about 10 minutes. A positive repo can be taken only if two or more typical bacilli have been seen. Ref: Textbook of Microbiology By Ananthanarayan And Paniker, 7th edition, Page 357.
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