A unit of blood was donated at a local blood drive last week…
A unit of blood was donated at a local blood drive last week and tested for a variety of infectious diseases. The combination test for HIV-1 and HIV-2 was positive but with a very weak titer. What action steps should be taken next?
Read DetailsA patient from Arizona showed large sac-like structures from…
A patient from Arizona showed large sac-like structures from a sputum culture on direct wet mount. Lactophenol Cotton Blue stain revealed numerous small cells inside the sac, but no budding-yeast forms. The culture grew a soft, white, fluffy mold with arthroconidia. This organism is most likely (M27-14, M27-15, M60-17, 21; Level 3):
Read DetailsA specimen of hair from a child with low-grade scaling lesio…
A specimen of hair from a child with low-grade scaling lesions of the scalp fluoresced under a Wood lamp. Culture identified the organism as Microsporum audouinii. Which of the following is most likely true of the microscopic observations (M59-17, 21; Level 3)?
Read DetailsA patient is bitten by a raccoon but displays no symptoms un…
A patient is bitten by a raccoon but displays no symptoms until about 6 weeks after the incident. The patient displays confusion and refuses to drink water. A week later the patient becomes unresponsive and dies. An autopsy was performed and Negri bodies were noted in the brain tissue. What is the most likely causative agent (M66-7, 13; Level 2)?
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