The Vibrio cholerae factor responsible for diarrhea is a toxin that (p 260)

Which organism causes red tides and produces toxins harmful to humans? (p 7)

A 16-year-old female patient presented to her family physician with a complaint of an abnormal vaginal discharge and pruritus (itching). The patient denied having sexual activity and recently completed a course of doxycycline for the treatment of her acne. An examination of a Gram-stained vaginal smear revealed the presence of gram-positive oval cells about 4–8 µm in diameter. Her vaginitis is caused by which of the following agents? (p9)

What does Gram-staining mainly differentiate bacteria based on? (p 38)

Which of the following is not considered as a potential agent of bioterrorism and biologic warfare? (p279)

A previously healthy 23-year-old woman recently returned from her vacation after visiting friends in Arizona. She complained of severe headaches, saw “flashing lights,” and had a purulent nasal discharge. She was admitted into the hospital with a diagnosis of bacterial meningitis and died 5 days later. Which of the following parasites should have been considered in the diagnosis? She had no prior history of travel outside of the United States. (Jawetz Microbiology, p 738)

A Tzanck smear of a scraping obtained from a vesicle on the skin demonstrates multinucleated giant cells. Multinucleated giant cells are associated with which of the following viruses? (p 480)

An 8-year-old boy develops a circular dry, scaly, and pruritic lesion on his leg. What is the diagnostic significance of observing branching, septate, nonpigmented hyphae in a potassium hydroxide/calcofluor white preparation of a scraping from this skin lesion? (p 701)

A 40-year-old man has HIV/AIDS characterized by a low CD4 count and a high viral load. Highly active antiretroviral therapy (HAART) will be initiated. One of the drugs under consideration is a nucleoside analog that inhibits viral reverse transcriptase and is active against both HIV and hepatitis B virus. That drug is (Harrisons Internal Medicine, p 438)

Which of the following immunoglobulin classes is the most abundant immunoglobulin in newborns?

Which of the following immunoglobulins, if detected in a newborn, is most indicative of an intrauterine infection?

Which pathogen is most frequently identified in cases of Brodie abscess?

What is the overall most common cause of osteomyelitis?

Which of the following toxins is an important virulence factor in CA-MRSA?