[1] Publ Hlth England, Immunisat & Countermeasures Div, London NW9 5EQ, England
[2] St Georges Univ London, Paediat Infect Dis Res Grp, London, England
[3] Univ Oxford, Nuffield Dept Primary Care Hlth Sci, Oxford, England
[4] Publ Hlth England, Antimicrobial Resistance & Hosp Acquired Infect D, London, England
[5] Evelina London Childrens Hosp, Paediat Infect Dis & Immunol, London, England
[6] Kings Coll London, Fac Life Sci & Med, London, England
[7] Publ Hlth England, Stat Modelling & Econ Dept, London, England
[8] Publ Hlth England, Microbiol Serv Colindale, London, England
[9] London Sch Hyg & Trop Med, London, England