(Single Best Answer) Question 91: A VDRL reactive mother gave birth to an infant. All of the following would help in determining the risk of transmission to the infant except ?
A) TPHA test on the serum sample of the mother B) TPHA test on the serum sample of the infant C) VDRL on the paired serum sample of the infant and mother D) Time interval between the treatment of the mother and her delivery Answer (Select an option above to get the answer):
A) Increases the levels of intracellular cyclic GMP B) Acts through the receptor for opiates C) Cause continued activation of adenylate cyclase D) Inhibits the enzyme phosphodiesterase Answer (Select an option above to get the answer):
A) Aspergillus B) Coccidoides C) Histoplasma D) Toruloplasma Answer (Select an option above to get the answer):
(Single Best Answer) Question 97: An infant had high grade fever and respiratory distress at the time of presentation to the emergency room. The sample collected for blood culture was subsequently positive showing growth of á haemolytic colonies. On Gram staining these were gram positive cocci. In the screening test for identification, the suspected pathogen is likely to be susceptible to the following agent ?
A) Bacitracin B) Novobiocin C) Optochin D) Oxacillin Answer (Select an option above to get the answer):
(Single Best Answer) Question 98: A patient admitted to an ICU is on central venous line for the last one week. He is on ceftazidime and amikacin. After 7 days of antibiotics he develops a spike of fever and his blood culture is positive for gram positive cocci in chains, which are catalase negative. Following this, vancomycin was started but the culture remained positive for the same organism even after 2 weeks of therapy. The most likely organism causing infection is ?
A) Staphylococcus aureus B) Viridan streptococci C) Enterococcus faecalis D) Coagulase negative Staphylococcus Answer (Select an option above to get the answer):
A) B. fragilis is the most frequent anaerobe isolated from clinical samples B) B. fragilis is not uniformly sensitive to metronidazole C) The lipopolysaccharide formed by B. fragilis is structurally and fucntionally different from the conventional endotoxin D) Shock and disseminated intravascular coagulation are common in Bacteriodes bacteremia Answer (Select an option above to get the answer):