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In an overcrowded poverty-stricken central core of a United States-Mexico border town, a 15 month old baby girl is admitted to the city hospital. Physical examination of this child reveals fever, repetitive coughing spells that make the child gasp for air, and a cyanotic appearance. Laboratory findings show lymphocytosis. The probable diagnosis is

Specimens for viral isolation

A number of vacationers who have traveled outside the U.S. have had their vacations interrupted by a case of “traveler’s diarrhea,” which is commonly associated with which etiologic agent?

Which one of the following drugs is not considered as primary antimycobacteria therapy?

The lowest concentration of antibiotic that inhibits growth of a test organism is the

Which Clostridium spp is most commonly recovered from cases of gas gangrene?

A gram-negative rod is inoculated into nitrate broth and incubated for 24 hours. After equal amounts of alpha-naphthylamine and sulfanilic acid are added, no color develops. Zinc dust is added and still no color develops. What action should your take?

Which drug known to be active against parasitic infections has importance as a therapeutic agent in cases of disease caused by anaerobic bacteria and is sold as Flagyl?

A  yellow colony from a skin lesion grew aerobically. It was a gram positive cocci, catalase positive, coagulase negative.  A modified oxidase test was performed and it was positive.  The most likely organism is

An antibiotic that inhibits cell wall synthesis is