PLE Category: Microbiology

PLE-3270

This antigen/antibody is generally detectable only after the Hepatitis B virus is no longer detectable, and it is used to suggest a lower risk of transmission.

PLE-3266

A 40-year-old male, known case of type I diabetes but poorly compliant with medications, presents to the ER with a 3-day history of left facial pain, proptosis, purplish discoloration of the periorbital area, and hemorrhagic exudates from the nose. Do you suspect a fungal infection? What will a biopsy of the infected tissue reveal?

PLE-3267

A 28-year-old male consults due to a one-week history of passing greasy, foul-smelling, yellowish stools. He also complains of nausea, flatulence, and abdominal bloating. Additionally, his male sexual partner is experiencing the same symptoms. Which of the following findings would you expect in this patient?

PLE-3264

Which organisms lack superoxide dismutase and cannot use O2 as a terminal electron acceptor?

PLE-3265

Which of the following statements does not describe the most likely etiologic agent for an 8-year-old male from a rural barangay who was brought to the local health center for passing large volumes of loose watery rice water stools?

PLE-3263

35/F presents with a 1-week history of fever, chills, and left ankle pain. The patient is a known IV drug abuser. On PE, vital signs are as follows: BP 110/60, HR 108, RR 18, T 40C. Auscultation reveals a grade 2/4 holosystolic murmur best heard at the right upper sternal border. The left ankle is visibly swollen and warm. Which of the following describes the most likely etiologic agent?

PLE-3261

A previously healthy 57-year-old man comes to the physician because of a nonpruritic rash over both legs for 1 week and a low-grade fever for 2 days. He recently returned from a 2-week canoe trip on a river in Minnesota. His temperature is 37.2 C (99 F). Examination shows a 4 x 6-cm, macular, dark pink, ovoid lesion on the right posterior hip with central clearing and a punctate eschar near the center. There are macular ring lesions with central clearing over the medial tibia and anterior thighs of the lower extremities. He has no lymphadenopathy. What is the most likely causal organism?

PLE-3262

A 2-year-old girl has had fever and bloody diarrhea for 10 days. A stool culture obtained 7 days ago grew Salmonella species sensitive to amoxicillin. A blood culture was negative. Despite beginning oral amoxicillin therapy 4 days ago, her diarrhea has persisted. Current examination shows no other abnormalities, except for a temperature of 38.6 C (101.5 F). Which of the following is the most likely explanation for the failure of amoxicillin to improve her symptoms?

PLE-3258

The following viruses are properly matched with the cancer they cause in humans, except for which one?