Which of the following is a commonly encountered gram-negative, facultative anaerobic bacillus bacteria?
a. Escherichia coli c. Neisseria meningiti-dis
b. Clostridium tetani d. Haemophilus parainfluenzae
ANS: A
Escherichia coli are gram-negative, rod-shaped facultative anaerobes. Clostridium are gram-positive, rod-shaped anaerobes. Neisseria meningitidis are gram-positive aerobes that occur in chains. Haemophilus parainfluenzae are gram-negative, rod-shaped aerobes.
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