[1] Great Ormond St Hosp NHS Fdn Trust, Camelia Botnar Lab, Dept Microbiol Virol & Infect Prevent & Control, London WC1N 3JH, England
[2] UCL, Dept Stat Sci, London, England
[3] UCL, Inst Child Hlth, Infect Dis & Microbiol Unit, London, England
[4] Univ Reading, HaCIRIC, Reading, Berks, England
[5] Univ Coll London Hosp, Dept Microbiol, London, England