PLE Category: Microbiology

PLE-3299

A group of 25 fifth-grade students had lunch at a fast-food restaurant. Most ate hamburgers and French fries, prepared quickly for the noontime rush. The next day, most of the children experienced severe bloody diarrhea and nausea, with several requiring hospitalization. Stool and blood cultures recovered a small, gram-negative, non-mucoid bacilli which fermented lactose, were indole positive, produced acid and carbon dioxide, but produced neither hydrogen sulfide nor urease. The organism most likely responsible for the intestinal infection is:

PLE-3300

What is the drug of choice for Trichuris trichuria infection?

PLE-3296

During an annual check-up, a 34-year-old engineer, who is asymptomatic, was found to have several cysts in his stool specimen. These cysts showed 4 nuclei with rounded chromatoid bodies. Which of the following is/are the most probable organism involved?

PLE-3295

A 45-year-old female went to Mississippi for her vacation. Two weeks after, she developed a productive cough with whitish phlegm. She took a consultation and was given an antibiotic, but no relief was noted. She then developed dyspnea as the cough persisted for two weeks. If you suspect fungi as the causative agent, which of the following is the most probable culprit?

PLE-3291

A 30-year-old man, who worked as a volunteer in the rescue mission during the Habagat, suddenly developed high fever, intense headache, calf pains, and conjunctivitis. He came in for consultation due to the development of jaundice. Examination revealed impaired hepatic and renal functions. What is/are the prophylactic regimens that should have been given to this patient?

PLE-3292

An HIV-positive 30-year-old male developed a cough, fever, and dyspnea. Work-up showed a lung abscess, and sputum examination showed gram-positive, aerobic filaments that are acid-fast. The most probable etiologic organism is:

PLE-3293

Which of the following diseases, in which the virus spreads in the body through the bloodstream and affects multiple organs, is NOT included?

PLE-3294

Which of the following correctly describes the only single-stranded DNA virus that is pathogenic to humans?

PLE-3289

Which hepatitis virus is a DNA virus?