摘要 : From November 1993 to September 1995, faecal samples (n=218) were obtained from 1- to 30-day-old, diarrhoeic dairy calves in 65 Spanish dairy herds. The samples were screened for the presence of rotavirus and concurrent infections... 展开 From November 1993 to September 1995, faecal samples (n=218) were obtained from 1- to 30-day-old, diarrhoeic dairy calves in 65 Spanish dairy herds. The samples were screened for the presence of rotavirus and concurrent infections with coronavirus,Cryptosporidium, F5+ Escherichia coli and Salmonella spp. Calves were grouped according to their age as follows: 1-7, 8-14, 15-21 and 22-30 days. Rotavirus infection was detected in 46.9%, 45.6%, 33.8% and 48.3% of the calves in the respective age-groups. No significant differences in the detection rate of rotavirus were found among calves of the different age-groups. Rotavirus was the only enteropathogen detected in 39 of the 93 (41.9%) diarrhoeic calves positive to this agent. Concurrent infections with other enteropathogen(s) were detected in 31.3%, 33.3%, 20.6% and 3.4% of the rotavirus infected calves in the age-groups 1-7, 8-14, 15-21 and 22-30 days, respectively. A significant age-associated decrease in the detection rate of mixed infections wasfound. The detection rates of the other enteropathogens considered in calves with rotavirus infection were 20.4% for coronavirus, 85.2% for Cryptosporidium, 16.7% for F5+ E. coli and 1.8% for Salmonella spp. 收起