[1] Department of Microbiology and Infectious Diseases,
[2] University Hospital,undefined
[3] Queen's Medical Centre,undefined
[4] Nottingham NG7 2UH,undefined
[5] UK,undefined
[6] e-mail: michael.emmerson@nottingham.ac.uk,undefined
[7] Tel.: + 44-01 15-9 70-91 62,undefined
[8] Fax: + 44-01 15-9 70-92 33),undefined