What are the types of infections caused by Haemophilus influenzae?
Haemophilus influenzae is classified into two major groups: encapsulated (typeable) and non-encapsulated (nontypeable). The encapsulated strains are further divided into six serotypes (a through f), with type b (Hib) being the most virulent and historically the leading cause of serious invasive disease. Non-encapsulated strains are often responsible for otitis media, sinusitis, and bronchitis.
