The four are in isolation while their contacts are being traced. They join three other Vatican residents who tested positive in recent weeks.

The predominant global economic system is "unsustainable," particularly in its impact on the environment, Pope Francis said.

The Society of Jesus and the local church in Ranchi, India are calling for the immediate release of Stan Swamy, S.J.

In the series finale, Sebastian speaks with Bishop Robert McElroy of San Diego, a leading voice on Catholic Social Teaching in the American hierarchy. How should Catholics prioritize the issues? And what does it really mean to form your conscience?

The Catholic Bishops teach that abortion is a preeminent voting issue for Catholics, because it directly attacks life itself. Do Catholics agree? And should it take precedence over other life and death issues?

Father Gabriele Martinelli faces charges of sexually abusing younger boys when he was a seminarian at the St. Pius X Pre-Seminary. Father Enrico Radice, former rector of the seminary, is accused of aiding and abetting the abuse.