evidence: If a potential donor who was vaccinated doesn’t know the manufacturer of the COVID-19 vaccine they received, the American Red Cross asks them to wait two weeks before donating blood to prevent the risk of spreading the virus from a live-attenuated vaccine. [...] An American Red Cross questionnaire asking blood donors about their vaccination status does not show that COVID-19 vaccines are unsafe, as some social media users have claimed. [...] First, the question is not new. American Red Cross spokesperson Daniel Parra told PolitiFact in an email that the organization has been asking potential donors if they’ve been vaccinated against COVID-19 since December 2020.