[1] Univ Autonoma Barcelona, Dept Med, Hosp Mutua Terrassa, Serv Internal Med, Barcelona 08221, Spain
[2] Univ Autonoma Barcelona, Dept Med, Hosp Mutua Terrassa, Microbiol Serv, Barcelona 08221, Spain
[3] Univ Autonoma Barcelona, Dept Pathol, Fac Vet, Hosp St Pau, E-08193 Barcelona, Spain
[4] Univ Autonoma Barcelona, Dept Microbiol, Fac Med, Hosp St Pau, E-08193 Barcelona, Spain
[5] Inst Salud Carlos III, Ctr Nacl Epidemiol, Madrid, Spain