1. Overview of vaccines and immunisation;Levine;Br Med Bull,2002
2. World Health Organization. Removing Obstacles to Healthy Development. Report on Infectious Diseases. 1999. Report No.: WHO/CDS/99.1.
3. State of the world's children;UNICEF,2005
4. Etiology of acute diarrhoea among children in developing countries: a multicentre study in five countries;Huilan;Bull World Health Organ,1991
5. Vaccines against Campylobacter jejuni;Scott;J Infect Dis,1997