Additional file 1.

Questionnaire used for the sero-epidemiological survey of the enzootic bovine leukosis in Japan, 2007. The questions inquired about cattle housing conditions, cow replacement, provision of own grazing area or free range on the farm, the presence of horseflies in summer, dehorning, the use of plastic sleeves for rectal palpation, change of needles used for herd vaccination, colostrum feeding, and general data on herd demography.

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Kobayashi et al. BMC Veterinary Research 2010 6:1   doi:10.1186/1746-6148-6-1