TABLE 1.

Sources of clinical isolates used in this study

Country of originSubmitting laboratory (city)No. of isolatesOutbreak isolates (yr)Reference
The NetherlandsAcademic Medical Center (Amsterdam)4Yes (1997)26
Leiden University Medical Center (Leiden)8No
PolandMedical University of Warsaw (Warsaw)12No33
FranceCentre Hospitalo-Universitaire Saint-Antoine (Paris)8No5
United StatesNorthwestern University (Chicago, Ill.)2No21
CanadaUniversity of Manitoba (Winnipeg)3Yes (1998)2
United KingdomUniversity Hospital of Wales (Cardiff)10No9
JapanGifu University School of Medicine (Gifu)3No24