[1] Univ Wales Hosp, Publ Hlth Lab, Anaerobe Reference Unit, Cardiff CF4 4XW, S Glam, Wales
[2] Llandough Hosp, Dept Med Microbiol, Penarth CF64 2XX, S Glam, Wales
[3] Univ Wales Hosp, Dept Infect Control, Cardiff CF4 4XW, S Glam, Wales
[4] Wrexham Maelor Hosp, Dept Microbiol, Wrexham LL13 7TD, Wales
[5] Glan Clwyd Hosp, Publ Hlth Lab, Rhyl LL18 5UJ, Clwyd, Wales
[6] Publ Hlth Lab, Bangor LL57 2PW, Gwynedd, Wales
[7] Withybush Gen Hosp, Dept Microbiol, Haverfordwest SA61 2PZ, Dyfed, Wales
[8] Bronglais Hosp, Dept Microbiol, Aberystwyth SY23 1ER, Dyfed, Wales