PLE Category: Microbiology

PLE-3509

An anaerobic organism from a necrotic wound of an extremity demonstrates double hemolysis on blood agar, growth on egg yolk agar, lecithinase (+); non-motile, but with a rapidly spreading growth pattern on culture. What is the most likely organism?

PLE-3510

What is the definitive diagnosis for HIV infection? This process involves a color reaction that reveals the presence of antibodies in the serum. The reaction occurs after the serum reacts to viral proteins displayed by acrylamide gel electrophoresis and transferred to nitrocellulose.

PLE-3511

What is true about the interaction between antibodies and antigens?

PLE-3504

A 6-year-old male patient was brought to you with severe dyspnea, poor intake, foul-smelling sputum, and decreased sensorium. Upon your diligent history, the patient had an apparent measles infection 2 weeks prior to the consult. Chest X-ray revealed Pneumatocoele. What may be the probable cause?

PLE-3505

A colleague of yours, who just came from Zimbabwe for a medical mission, has noted fever, periorbital edema, dilated cardiomyopathy, achalasia, and hepatosplenomegaly. Upon history, he mentioned being bitten by a reduviid bug while strolling around. What is the drug of choice for this patient?

PLE-3503

A Gram-positive bacteria was isolated in a septic, immunocompromised patient after ingestion of unpasteurized milk. Bacteriological studies revealed that the toxin from this bacteria is stable at 100°C, is a lipopolysaccharide, has low antigenicity, and a vaccine cannot be formulated using the toxin itself. Which of the following is the probable isolate?

PLE-3500

A patient came to you from Pangasinan, where his wife told you that he had been infected by a flesh-eating bacteria. You admitted the patient and submitted a specimen to the Pathology department for microbiological studies. The results revealed a double hemolysis on the Blood agar plate, growth on Egg yolk Agar, nonmotile bacteria with rapidly spreading growth, and positive for Lecithinase. What bacteria may be responsible?

PLE-3501

A 3-year-old boy was brought to you by his mother due to recurrent pyogenic infections since he was 6 months old. He has been in and out of the hospital since then. What complement may be deficient in this patient?

PLE-3502

After ingestion of almonds, a patient was rushed to your ED due to difficulty of breathing and angioedema. What immune mechanism might be occurring in this patient?