(Single Best Answer) Question 61: A 50 year old chronic alcoholic male agricultural worker presented with high grade fever of one week duration with spells of chills and rigor. Examination of the respiratory system revealed bilateral crepitations with scattered rhonchi. Multiple subcutaneous nodules were found on the extensor surface of the left forearm, arm and left leg. Direct microscopy of the pus aspirated from the skin nodule revealed plenty of Gram negative bacilli with bipolar staining. Culture revealed distinct rough corrugated grey-white colonies on Blood Agar. The organisms were motile and oxidase positive. The most likely diagnosis is ?
A) Plague B) Melioidosis C) Bartonellosis D) Actinomycosis Answer (Select an option above to get the answer):
(Single Best Answer) Question 62: An AIDS patient with T lymphocyte counts < 200 /mm3, presented with complaints of headache, nausea, dizziness and irritability. As a part of the diagnostic tests, spinal fluid was submitted to the laboratory with a request to examine the specimen directly in India ink to enhance visualization of encapsulated organisms. This request was made on the suspicion of a diagnosis of ?
A) Histoplasmosis B) Candidiasis C) Nocardiosis D) Cryptococcosis Answer (Select an option above to get the answer):
(Single Best Answer) Question 63: A patient made a self-diagnosis of athleteâ??s foot (tinea pedis) and began using a product advertised on television. The condition improved but did not clear and then the patient showed himself to a Dermatologist. A skin scraping was sent to the laboratory for culture, including culture for fungi. The fungal culture yielded a slow growing colony, which produced a few small microconidia. This is consistent with isolation of a dermatophyte of the genera ?
A) Trichophyton B) Microsporum C) Epidermophyton D) Trichosporon Answer (Select an option above to get the answer):
A) It is the most frequent anaerobe isolated from clinical samples B) It is not uniformly sensitive to metronidazole C) The lipopolysaccharide formed by B. fragilis is structurally and functionally different from the conventional endotoxin D) Shock and disseminated intravascular coagulation are common in bacteremia due to B. fragilis Answer (Select an option above to get the answer):
A) M protein B) Pyrogenic exotoxin C) Streptolysin O D) Carbohydrate cell wall Answer (Select an option above to get the answer):
(Single Best Answer) Question 67: There has been an outbreak of food borne salmonella gastroenteritis in the community and the stool samples have been received in the laboratory. Which is the enrichment medium of choice ?
A) Cary Blair medium B) V R medium C) Selenite 'F' medium D) Thioglycolate medium Answer (Select an option above to get the answer):
(Single Best Answer) Question 68: A 20 year old male had pain abdomen and mild fever followed by gastroenteritis. The stool examination showed presence of pus cells and RBCs on microscopy. The etiological agent responsible is most likely to be ?
A) Enteroinvasive E.coli B) Enterotoxigenic E.coli C) Enteropathogenic E.coli D) Enteroaggregative E.coli Answer (Select an option above to get the answer):
A) Outer membrane proteins B) Ig A Protease C) M - Proteins D) Pili Answer (Select an option above to get the answer):
(Single Best Answer) Question 70: A patient in an ICU is on a CVP line. His blood culture shows growth of gram positive cocci which are catalase positive and coagulase negative. The most likely etiological agent is ?
A) Staphylococcus aureus B) Staphylococcus epidermidis C) Streptococcus pyogenes D) Enterococcus faecalis Answer (Select an option above to get the answer):