A 6-year-old boy develops vesicular skin lesions on his trunk, which quickly spread to his extremities and appear on the scalp. Scrapings from the vesicles show multinucleated cells and Cowdry type A inclusion bodies. This disease could have been prevented with a vaccine composed of
A 55-year-old man develops a pyogenic infection along the suture line after knee surgery. The laboratory gives a preliminary report of a beta-hemolytic, catalase-positive, coagulase-positive, Gram-positive coccus. The most likely causative agent is:
A 55-year-old woman from Key West presents with a mosquito-borne viral disease in which her antiviral antibodies from an infection nearly a decade ago were thought to have an enhancing effect so that the current reinfection with the virus caused a more serious bleeding disease. What is the causative agent?
A 57-year-old man comes to your office with severe pain in his right testicle. Upon physical examination, significant swelling is observed. A small amount of urethral exudate was able to be aspirated. Microscopic examination and Gram staining revealed the presence of bacteria. What are the most likely bacteria causing this condition?
A 49-year-old woman who presents with muscle weakness and a thymoma is suspected of having myasthenia gravis. If correct, lab tests should show autoantibody against:
A 5-day-old infant girl now showing signs of sepsis is brought to the emergency department. She was preterm (33 weeks) and born at home to her 16-year-old mom after 22 hours of labor following the rupture of the membranes. A friend helped the mother deliver the baby. What is the best description for the agent most likely causing the sepsis if it was acquired during labor but prior to delivery? All organisms in the answer choices are Gram-positive, catalase negative cocci found in pairs or short chains.
A 5-year-old boy has a yearlong history of repeated staphylococcal and streptococcal infections. He was referred to the genetic counseling unit where he was found to have depressed superoxide dismutase activity. Treatment with which of the following is most likely to be successful?
A 5-year-old girl is brought to your rural clinic office by her mother who states the child has a runny nose, barking cough, and a sore throat. Your examination indicates respiration is labored. None of her three siblings is sick. The most probable viral cause of her symptoms is
A 46-year-old man had mental degeneration after a prolonged but inapparent infection. At autopsy, a subacute spongiform encephalopathy is found. What is the nature of the most likely causative agent?
A 46-year-old man who recently returned from Africa has been febrile for several days and now presents with abdominal pain. His blood cultures grow out Salmonella typhi. What was the most likely source of his infection?