Five teenagers in Mrs. Thompson’s ninth grade class develop a disease which begins as a bright red rash on the face, turns violet after a few days, then disappears; then, a maculopapular rash appears on the trunk, buttocks, and extremities. It soon fades from the trunk but persists on the thighs and forearms. Two teenagers have also had a slight fever and a sore throat, but none were terribly sick. The genetic material of the most likely causative infectious agent is:
An outbreak of respiratory disease that leads to pneumonia occurs in a retirement home. It is characterized by an interstitial x-ray pattern and both amantadine and zanamivir are effective treatments. What is the causative agent?
An untreated AIDS patient (CD41 count of 180 cells/mm3) from southern California has developed a progressively severe headache and mental confusion, along with ataxia and retinochoroiditis. Focal lesions are present on a computed tomography scan of his brain. No mucocutaneous lesions are found. He has been living under a bridge for the past 3 years. His level of immunoglobulin G (IgG) to the infectious agent is high. What is the most likely explanation for how this current infection started?
Based on the patient’s medical records showing a hepatitis B vaccination 2 years ago, how would you interpret the following HBV serological results?IgM antibody to hepatitis B core antigen: negativeIgG antibody to hepatitis B core antigen: positiveIgM antibody to hepatitis B surface antigen: negativeIgG antibody to hepatitis B surface antigen: positiveHBsAg: negative
An epithelial-derived cell expressing cell surface C3-antigen is a what?
An otherwise healthy 24-year-old woman presents with urinary urgency and frequency along with pain on micturition. What is the most likely causative agent?
An outbreak of pneumonia occurs in a neonatal intensive care facility. A negative single-stranded RNA virus lacking hemagglutinating and neuraminidase activity is isolated. The virus is a
Among the following fungal scalp infections, which one is most likely to cause permanent hair loss?
Among the individuals listed below, who is at the highest risk of developing a severe illness due to West Nile virus?
An 82-year-old who still lives in her own home has developed pneumonia following influenza. The Gram stain of her sputa is shown. What is the most likely agent?