M. catarrhalis can be described as a:
a. gram-positive diplococcus.
b. gram-negative diplococcus.
c. gram-negative coccobacillus.
d. gram-negative bacillus.
Folliculitis, furuncles, and carbuncles are localized abscesses either in or around hair follicles. Which organism is the most common etiologic agent for all three infections?
a. Pseudomonas aeruginosa
b. Staphylococcus epidermidis
c. Escherichia coli
d. Staphylococcus aureus
A 7-year-old girl was at summer camp and dove into the lake many times. She complained that water went up her nose a few times. Several days later she is unresponsive and comatose and rushed to the hospital. A cerebrospinal fluid (CSF) specimen is drawn, and several motile amebae are observed. She is most likely suffering from an infection with which of the following pa-rasites?
a. Plasmodium vivax
b. Naegleria fowleri
c. Ascaris lumbricoides
d. Hymenolepis nana
During specimen collection, an important thing to remember when handling a collection device with an oxygen-free atmosphere is to:
a. take care not to tip the container.
b. hold the collected specimen in the refri-gerator until processing.
c. hold the collected specimen in the incu-bator until processing.
d. avoid opening the container in an aerobic atmosphere.
Gram-negative broth serves which purpose when used in the bacterial fecal culture?
a. Evaluation of general flora and predomi-nant species
b. Selection of enteric pathogens such as Salmonella, Aeromonas, and others
c. Inhibition of normal flora and selection of enteric pathogens
d. Enrichment for enteric pathogens such as Salmonella and others
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