7Anonymous.WHO Surveillance programme for control of food -borne infections and intoxications in Europe. 6th report,1990-1992 [J].Federal Institute for Health Protection of Consumers and VeterinaryMedicine, 1995 ,Berlin.
9Limawongpranee S,Hayashidani H, Okatani AT, Ono K, Hirota C, Kaneko K, et al.Prevalence and persistence of Salmonella in broiler chicken flocks. J Vet Med Sci 1999,01:255-259.
10Benons L. Salmonella blockley infections in England and Wales, 1998. Eurosurveillance Weekly 1998;2:980924. Available at URL: http://www.eurosurv.org/1998/980924.htm Mueller -hinton(ph7.2).