Members of the 13-million-person denomination have been at odds for years over the issue.

In the fifth episode of "Plague," Mike visits the small Midwestern city of Belleville, Illinois, where a Catholic Sister broke ground in the 1980s by opening an organization to provide services for people living with HIV and AIDS.

Learn more at www.americamag.org/plague.

This is the story of the AIDS crisis from the perspective of a priest, trying to figure out what he could do to help.

The path to inclusion wasn’t straightforward.

In “Plague,” Michael O'Loughlin investigates untold stories of AIDS and the Catholic Church.