Haemophilus influenzae is a non-motile Gram-negative rod-shaped bacterium. H. influenzae can cause serious invasive disease especially in young children. Invasive disease is usually caused by encapsulated strains of the organism. Six typeable capsular serotypes (a-f) are known to cause disease. Prior to routine immunisation, H. influenzae serotype b (Hib) accounted for more than 80% of invasive H. influenzae disease.
This is a companion discussion topic for the original article at https://patient.info/doctor/haemophilus-influenzae