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Investigation of an outbreak of foot-and-mouth disease in vaccinated dairy cattle in Thailand
Authors:LJ GLEESON  P CHAMNANPOOD†  S CHEUNPRASERT‡  N SRIMASARTITKOL‡  A TRISASAROM§
Institution:*CSIRO Australian Animal Health Laboratory, PO Bag 24, Geelong, Victoria 3220;?Northern Veterinary Research and Diagnostic Center, Hang Chat, Lampang, 52190 Thailand;?Department of Livestock Development, Dairy Research Center, Mae Huak, Chiangmai, 50000 Thailand;§Department of Livestock Development, Animal Breeding Center, Huay Kaeow, Chiangmai, 50000 Thailand
Abstract:SUMMARY An outbreak of foot-and-mouth disease that spread between two related vaccinated dairy herds was investigated. Although the cattle were of similar vaccination status, in one herd there was high morbidity, whereas in the other there was considerably lower morbidity. The relationship between the vaccine virus and the outbreak virus was expressed as an r value determined by the two-dimensional neutralisation test. Bovine serum homologous to the vaccine virus indicated a close antigenic relationship between the vaccine virus and the outbreak virus (r = 0.61). The source of the outbreak virus was not determined. The investigation suggested a requirement for close contact between stock for foot-and-mouth disease to spread in a tropical environment, in contrast to the capacity of the disease to spread considerable distances by aerosol transmission in temperate climates.
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