FIG. 2.

Measurement of excretion of C. parvum oocysts in C57BL/6 and Rag2^−/− mice immunosuppressed with dexamethasone (DXM) following recovery from neonatal infection. C57BL/6 and Rag2^−/− mice were infected by oral gavage with C. parvum oocysts at 7 days of age. Ten weeks after recovery from acute infection, mice were immunosuppressed by i.p. injection with 1 mg dexamethasone on three consecutive days, and oocyst excretion was monitored for 6 days after the first injection. The percentage of mice that developed patent infection is shown. The values represent the mean numbers of oocysts per 50 fields ± standard errors for 9 animals per group.