EHEC outbreak: update 10
The outbreak remains primarily centred in Germany, and investigations continue into the nature of the unusual Escherichia coli bacteria serotype and its source.
Haemolytic uraemic syndrome (HUS)
As of 6 June at 15:00 CET, Germany had reported 642 HUS cases (including 15 fatalities): 12 more than the previous day. 68% of cases were in females and 88% in adults aged 20 years or older, with the highest attack rates per 100 000 population in the group aged 20–49 years. Case-onset dates ranged from 1 May to 2 June.
Enterohaemorrhagic Escherichia coli (EHEC)
As of 6 June at 15:00 CET, 1683 cases of EHEC infection (without HUS) had been reported in Germany (7 fatal): 82 more than the previous day. 61% of cases were in females and 88% in adults aged 20 years or older. Case onset dates ranged from 1 May to 3 June.
The Robert Koch Institute, in Germany, states that the current HUS and EHEC notification data, as well as data from the surveillance of bloody diarrhoea in emergency departments, suggest a slight decrease in the number of cases. Whether this decline will continue remains to be determined.
As of 6 June at 18:00 CET, 12 other European countries had reported a total of 31 HUS cases (1 fatal) and 73 EHEC cases (none fatal):
In addition, the Centers for Disease Control and Prevention (CDC) in Atlanta, United States of America had previously published information on 2 HUS cases in the United States linked to this outbreak.
All but one of the above HUS and EHEC cases were in people who had travelled to or lived in Germany during the incubation period for infection, typically 3–4 days after exposure (range: 2–10 days). An increasing number of cases is laboratory confirmed as EHEC serotype O104:H4, or more precisely a strain of enteroaggregative verocytotoxin-producing E. coli (EAggEC VTEC) O104:H4.
Investigations continue into the source of the outbreak.
EHEC and HUS have exclusive notification categories, so case numbers should not overlap. The figures in any rapidly evolving outbreak, however, are provisional and subject to change for a variety of reasons.
In providing the above information, WHO wishes to recognize the contribution of its Member States, and technical partners such as the European Commission, the European Centre for Disease Prevention and Control and a number of WHO collaborating centres.