| occurrence of giardia and cryptosporidium in pigs on prince edward island, canada. | in a cross-sectional study of 633 pigs from 21 herds on prince edward island, canada (pei), the prevalence of infection with cryptosporidium and giardia, and the genotypes and species of isolates were determined in order to establish the zoonotic potential of pigs in this region. as determined by direct immunofluorescence microscopy (dfa), 18 herds (86%) and 163 animals (26%; 95% ci: 22-29%) tested positive for cryptosporidium, while just 3 herds (14%) and 6 animals (1%; 95% ci: 0.4-2%) tested p ... | 2011 | 21868167 |