Haemophilus influenzae Invasive Disease, 2005

Fifty-three cases of invasive Haemophilus influenzae disease (1.0 per 100,000 population) were reported in 2005. Case-patients ranged in age from newborn to 98 years (median, 62 years). Twenty (38%) case-patients had pneumonia, 20 (38%) had bacteremia without another focus of infection, two (4%) had meningitis, and 11 (21%) had other conditions. Five (9%) deaths were reported among these case-patients.

Of 47 H. influenzae isolates for which typing was performed at MDH, 13 (28%) were type f, two (4%) type a, one (2%) type e, one (2%) type b, and 30 (64%) were untypeable.

One case of type b (Hib) disease occurred in 2005, compared to two cases in 2004, and five cases in 2003. The 2005 Hib case occurred in an adult older than 30 who had significant underlying medical conditions. The case-patient had bacteremia and survived.

The five deaths occurred in patients ranging in age from newborn to 91 years. Four case-patients presented with pneumonia and one with bacteremia without another focus of infection. All case-patients had H. influenzae isolated from blood. Three had significant underlying medical conditions, including the premature newborn (29 weeks gestation). Four of the isolates from the five deceased case-patients were untypeable isolates and one isolate was serotype f.

• For up to date information see>> Haemophilus influenzae (invasive disease)
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• Full issue>> Annual Summary of Communicable Diseases Reported to the Minnesota Department of Health, 2005