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chapter 1 Microbiology 13<br />

Cocci<br />

Aerobic<br />

Neisseria<br />

Moraxella*<br />

Fastidious<br />

organisms<br />

Haemophilus*<br />

Campylobacter<br />

Helicobacter<br />

Bartonella<br />

HACEK organisms †<br />

* = these organisms may appear as coccobacilli<br />

† = Haemophilus, Actinobacillus, Cardiobacterium, Eikenella, Kingella<br />

would be most useful is in the setting of meningitis, where this finding<br />

would strongly suggest Neisseria meningitidis. Note also that<br />

some organisms have an intermediate or “coccobacillary” appearance,<br />

which may suggest Haemophilus influenzae, Moraxella, or<br />

Acinetobacter.

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