1. Control of communicable diseases manual;Heymann,2008
2. Travel health and migrant section. Epidemiological summary of enteric fever in England, Wales and Northern Ireland 2010;Health Protection Agency,2011
3. Health Protection Agency. Travel Health and Migrant Section. Enhanced surveillance report for London. NENCL Unpublished
4. Preventing person-to-person spread following gastrointestinal infections: guidelines for public health physicians and environmental health officers;Working Group of the former PHLS Advisory Committee on Gastrointestinal Infections;Commun Dis Public Health,2004
5. How long should patients with Salmonella typhi or Salmonella paratyphi be followed-up? A comparison of published guidelines;Braddick;J Public Health Med,1991