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When a host—humans included—consumes an oocyst, the spores are released and spread into the brain and muscles, forming new cysts.

Only in the feline gut can it reproduce sexually and assume a hardy, infectious form called an oocyst, which gets excreted to infect more animals.

Accidental ingestion or inhalation of an oocyst causes infection, and a growing body of evidence consistently points to widespread environmental contamination with T. gondii from free-roaming cats.

It lurks in a protected form called an oocyst.

When a swimmer swallows the oocyst, the parasite pops out and squirms into the cells lining his or her gut, where it multiplies.