The median infectious dose for humans is 132 oocysts, however, this number may be lower for some strains of Cryptosporidium. Three isolates examined by Okhuysen et al. (1999) demonstrated an ID50 varying between 9 and 1042
The median infectious dose for humans is 132oocysts, however, this number may be lower forsome strains of Cryptosporidium. Three isolatesexamined by Okhuysen et al. (1999) demonstratedan ID50 varying between 9 and 1042