Cryptosporidium infection in calves aged up to three months

The prevalence of Cryptosporidium infection among calves aged up to three m onths in the Belgrade district was examined. The animals were grouped accor ding to age, i.e., up to 15 days old, 16 to 30 days, 31 to 60 days and 61 t o 90 days old. The infection was diagnosed using. Sheathers sugar flotation and three staining procedures: modified Ziehl-Neelsen's, modified Kinyoun' s and BBL TB Quick Stain techniques, Among the examined calves 54.0% excreted Cryptosporidium oocysts. The major ity of positive results was detected among calves aged up to 15 days (63.1% ). Most of the positive animals, aged up to one month, had diarrhea. The hi ghest number of positive cases was detected using the flotation method acco rding to Sheather (54.0%), followed by modified the Ziehl-Neelsen method (5 3.2%), while the modified method according to Kinyoun and the BBL TB Quick Stain method detected a smaller number of positive animals (50.0%).