HAEMOPHILUS INFLUENZAE

MICROBIOLOGY

H. influenzae is a small, gram-negative, pleomorphic coccobacillus that grows both aerobically and anaerobically.

Six major serotypes (designated af) have been identified on the basis of antigenically distinct polysaccharide capsules.
Unencapsulated strains are referred to as nontypable (NTHi).

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