""It may turn out, however, that one does not really have a choice of vaccine, at least, not without a lengthy delay in immunization that may have serious consequences for one's health and the health of others," said the bishops. "In such a case, just as accepting a vaccination for rubella with a morally compromised vaccine is morally permissible because of the lack of alternatives and the serious risk to the public health, so it would be permissible to accept the AstraZeneca vaccine," they said. A person who refuses to be vaccinated, said the bishops, has "a moral responsibility to undertake all the precautions necessary to ensure that one does not become a carrier of the disease to others, precautions which may include some form of self-isolation." While the vaccines for coronavirus are permissible to receive despite their moral flaws, it is imperative that Catholics "must be on guard so that the new COVID-19 vaccines do not desensitize us or weaken our determination to oppose the evil of abortion itself and the subsequent use of fetal cells in research," they said. "For our part, we bishops and all Catholics and men and women of good will must continue to do what we can to ensure the development, production, and distribution of a COVID-19 vaccine without any connection to abortion," said the bishops."