Since vaccination against Haemophilus influenzae type b (Hib) became widesp
read, other strains of H. influenzae have become more common than Hib as ca
uses of disease in vaccinated children. A four-month-old, appropriately vac
cinated infant presented with meningitis and septicaemia caused by H. influ
enzae biotype III. To our knowledge, this is the first reported case of men
ingitis caused by this biotype, which is not detectable by Hib antigen test
s.