PLE Category: Microbiology

PLE-3171

A 65-year-old male went for a consultation due to one week of fever episodes, weight loss, and palpitations. Upon physical examination, it was noted that he was tachycardic and had a holosystolic murmur at the 5th left intercostal space midclavicular line, which radiated towards the axilla. An echocardiogram revealed the presence of vegetations in the mitral valve. Blood culture results showed the presence of a gram-positive organism that is PYR positive, esculin positive, and can grow in 6.5% NaCl and bile. What ancillary procedure should be done next?

PLE-3166

In what structure in the CNS are Negri bodies, the pathognomonic lesion in rabies, most commonly seen?

PLE-3167

In which phase of the microbial growth curve is the growth rate constant?

PLE-3163

Necrotizing fasciitis caused by Streptococcus pyogenes is mediated by which of the following toxins?

PLE-3164

Which of the following causative agents of malaria, with repeated or chronic infections, has been implicated in causing nephrotic syndrome?

PLE-3165

Which of the following forms of extrapulmonary tuberculosis, when present, confers an individual to become highly infectious?

PLE-3160

Which species of adult trematodes do you expect to reside in the mesenteric venules of the GI tract?

PLE-3161

A 55-year-old male, who works as a caretaker in an aviary, presented with a 6-day history of neck stiffness, headache, and vomiting. CSF analysis revealed mild elevation of protein levels and a decreased glucose level. He was started on intravenous ceftriaxone; however, there was no note of clinical improvement. Which of the following etiologic agents is most likely responsible for his symptoms?

PLE-3162

A 22-year-old male presented with a 5-day history of fever and calf pain. He admitted to wading in flood water one week ago. Physical examination reveals a hyperemic conjunctiva and an icteric sclerae. Laboratory findings showed elevated creatinine and thrombocytopenia. Which of the following is the most appropriate antibiotic for this case?