Infection with anthroponotic Cryptosporidium parvum does not fully protect the host against a subsequent challenge with C. hominis.

Cryptosporidium hominis and Cryptosporidium parvum are the major Cryptosporidium species that infect humans. Earlier studies in gnotobiotic piglets, model susceptible to both, showed that piglets recovered from infection with C. hominis were fully protected against challenge with same species but incompletely protected against C.

Growing support for gay and lesbian equality since 1990.

Since 1991, public acceptance of gays and lesbians has grown dramatically. We use two approaches to examine changing attitudes in U.S.