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An elderly patient in a nursing home is recovering from bacterial pneumonia.  The patient has been on a lengthy regiment of antibiotics to kill the organism causing the disease.  A few days later the patient is diagnosed with pseudomembranous colitis.  What organism is the most likely cause?

The following curved Gram negative bacilli is associated with water sources:

A young woman went to the Emergency Room with irritated eyes. After examining her, the physician found she had an infection in both of her corneas. A swab of the lesion revealed a spindle ‘canoe’ shaped macroconidia. What is the most likely causative agent?

A sheep blood agar plate inoculated with 0.001mL of urine grows 50 colonies of Staphylococcus aureus. How many colony forming units per mL of urine should be reported.

A microbiologist reading a stool culture notices a very moist, mucoid pink colony on MacConkey agar and a yellow colony on Hektoen.  Which of the following is true?

The fecal-oral route of infection is commonly associated with which of the following:

Which of the following organisms ia white and non-hemolytic on SBA , is a non-fermenter on mannitol salt agar, and may be the cause of a nosocomial infection?

A 19 year old patient presents with pharyngitis. A throat swab is collected and submitted for anaerobic culture. This specimen should be:

Which of the following is likely to be found in clinical specimens as normal flora as well as a clinically significant isolate?

MacConkey (MAC) agar is used for the isolation of: