Haemophilus influenzae Disease (Including Hib) - ISS-G20 Laboratorium Repository

Etiologic agent

Haemophilus influenzae is a pleomorphic gram-negative coccobacillus. H. influenzae may be either encapsulated (typeable) or unencapsulated (nontypeable). There are 6 encapsulated serotypes (designated a through f) that have distinct capsular polysaccharides.

Clinical features

Disease caused by H. influenzae can affect many organ systems. The most common types of disease caused by H. influenzae type b (Hib) include

Less common infections include endocarditis and osteomyelitis.

Non-b but typeable (i.e., a, c, d, e, and f) H. influenzae (hereto after referred to as non-b H. influenzae) can cause disease similar to Hib infections. Nontypeable H. influenzae commonly causes ear infections in children and bronchitis in adults, but can also cause invasive disease.

Entire content available on: https://www.cdc.gov/hi-disease/clinicians.html