[1] Hlth Protect Agcy, HIV STI Dept, London NW9 5EQ, England
[2] Hlth Protect Agcy, Virus Reference Dept, London NW9 5EQ, England
[3] Univ London, London SW17 ORE, England
[4] Univ Coll Hosp NHS Fdn Trust, Windeyer Inst Med Sci, London W1T 4JF, England
[5] Norfolk & Norwich Univ Hosp, Dept Microbiol, NRP Innovat Ctr, Norwich NR4 7GJ, Norfolk, England
[6] Aintree Univ Hosp NHS Fdn Trust, Aintree Univ Hosp NHS Fdn Trust, Liverpool L9 7AL, Merseyside, England
[7] Royal Cornwall Hosp NHS Trust, Dept Microbiol, Truro TR1 3LJ, England
[8] Univ Hosp N Staffordshire NHS Trust, Cent Pathol Lab, Stoke On Trent ST4 7PX, Staffs, England