Covid-19 vaccine and transplant patients (IMAGE) Johns Hopkins Medicine Caption Johns Hopkins Medicine researchers have shown that although two doses of a vaccine against SARS-CoV-2 -- the virus that causes COVID-19 -- confers some protection for people who have received solid organ transplants, it's still not enough to enable them to dispense with COVID safety measures. Credit Graphic created by M.E. Newman, Johns Hopkins Medicine, with public domain images and background transplant surgery photograph courtesy of Johns Hopkins Medicine Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.