Abstract
Piglets naturally exposed or experimentally infected with Isospora suis oocysts were given challenge doses of oocysts to determine the extent of development of immune resistance. Piglets in both studies shed low numbers of, or no detectable oocysts, following challenge. Administration of methylprednisolone acetate failed to induce oocysts shedding in previously infected piglets. Piglets rechallenged with I. suis following steroid injections also failed to shed significant numbers of oocysts suggesting development of immunity to reinfection.
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