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Disease causing isolates of the genus Clostridia possessing the exotoxin B gene are likely to possess the _______ gene.

A 21 year-old female attends clinic with evidence of pharyngitis. Initial treatment with penicillin V does not resolve the infection, leading her physician to believe the original diagnosis of S. pyogenes to have been incorrect. What other microbes might the physician suspect as possible causes of her illness?

Prior to the creation of a protective vaccine, which virus was responsible for the largest number of pediatric diarrheal infections?

Marco is infected with an isolate of Escherichia coli that was serotyped as O13:H9:K1. Given his serotype, what disease is he at greatest risk for developing?

Which of the following would involve the formation of visible quantities of pus?

Congenital infection of the fetus carried by a pregnant woman is possible when the woman is infected with:

Epidemiologists called in by the NYS Department of Health culture samples of the food eaten by a number of patients believed to be suffering from Clostridium perfringens food poisoning. Unsurprisingly, they confirm the clinical diagnosis because they find large numbers of:

The signs and symptoms of hepatitis caused by Hepatitis A virus infection are the result of

BONUS:  You have a patient that is suffering from a severe pyoderma. Lancing and subsequent microscopic investigation of the pustular exudate has revealed the presence of Gram-positive cocci that produce streptokinase. What can you conclude from this information alone?

Which of the following vaccines protects against norovirus infection?