Effect of hyperimmune bovine colostrum raised against Cryptosporidium parvum on infection of guinea pigs by Cryptosporidium wrairi.

Oocysts shedding was markedly reduced in guinea pigs inoculated intraintestinally with Cryptosporidium wrairi sporozoites that had been incubated with hyperimmune bovine colostrum raised to C. parvum when compared with shedding in guinea pigs inoculated with sporozoites incubated in either non-immune bovine colostrum or buffered saline. However oocyst shedding was apparently not reduced in guinea pigs inoculated by gavage with oocysts of C. wrairi and subsequently treated twice daily per os with hyperimmune bovine colostrum. Similarly, oocyst shedding was apparently not reduced by oral treatment with hyperimmune bovine colostrum when treatment was begun simultaneously with inoculation of C. wrairi oocysts.