Covid-19 vaccine and transplant patients (IMAGE) Johns Hopkins Medicine Caption A medical assistant prepares a dose of a COVID-19 vaccine to be administered to a patient. Johns Hopkins Medicine researchers recently showed that after one dose of the vaccine, organ transplant patients and other immunocompromised people may not produce high levels of antibodies against SARS-CoV-2, the virus that causes COVID-19. Credit Public domain image courtesy of Lisa Ferdinando, U.S. Department of Defense 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.