| cryptosporidium infection of cattle in the tokachi district, hokkaido. | the prevalence of cryptosporidium infection was examined in 480 healthy cattle (0-39 months old) in the tokachi district in hokkaido during the period from june to september in 2000 and from june to july in 2001. c. parvum oocysts were detected in 6 of 50 cattle (0-2 months old) in 2001; while c. muris was detected in 2 of 56 cattle (6-8 months old) in 2001, in 1 of 15 cattle (9-11 months old) in 2001, in 1 of 88 cattle (15-17 months old) in 2000, in 4 of 89 cattle (18-21 months old) in 2000 and ... | 2003 | 12576718 |