Haemophilus influenzae


See 'Additional Information'
See 'Additional Information'

General Information

Pathogen information

Small gram negative bacillus, encapsulated or not (non=non-typeable)


Normal respiratory flora

Invasive disease sharply declined after Hib type b conjugate vaccine widely used

Most invasive disease is now caused by other capsular subtypes such as H. flu type a.

Associated syndromes

Colonizer of the upper respiratory tract

May cause invasive disease including meningitis, pneumonia/empyema, bacteremia, epiglottitis, MSK infection and others

Additional Information

Maintain Droplet Precautions for invasive disease until 24 hours of appropriate antibiotic therapy has been received

Close contacts < 48 months old who are not immune may require chemoprophylaxis

Invasive disease is notifiable - call Public Health ASAP