[1] Linkoping Univ Hosp, Dept Infect Dis, S-58185 Linkoping, Sweden
[2] Univ Iowa, Coll Med, Div Med Microbiol, Iowa City, IA USA
[3] Univ Iowa, Coll Med, Div Infect Dis, Iowa City, IA USA
[4] Eijkmann Winkler Inst Microbiol, Utrecht, Netherlands
[5] Free Univ Brussels, Erasme Hosp, Dept Microbiol, B-1050 Brussels, Belgium
[6] Bristol Royal Infirm & Gen Hosp, Publ Hlth Lab, Bristol, Avon, England
[7] Hop Bichat Claude Bernard, Clin Reanimat Malad Infect, F-75877 Paris 18, France