However, Catholics also must urge doctors and pharmaceutical companies to let alternative, less controversial vaccines become more widely available for use, said Bishop Elio Sgreccia, former president of the Pontifical Academy for Life, who helped the Vatican prepare a new bioethics document.

The document said, however, that researchers and people involved in marketing vaccines have "the duty to avoid cooperation in evil and scandal" and must "refuse to use such biological material even when there is no close connection between the researcher" and those who destroyed the embryo or performed the abortion. ...