Bayad Abdalrahman1, Barry Walsh2, Mary Maimo2, Houda Al-Sharifi3. 1. East Midlands Local Education and Training Board; Department of Primary Care and Public Health, Imperial College London, Room 351, The Reynolds Building, St. Dunstan's Road, London W6 8RP, UK. Electronic address: b.abdalrahman@nhs.net. 2. Health Protection Teams, Public Health England, South West London Health Protection Team. 3. Public Health, Wandsworth Borough Council, London, UK.