LONDON - The United Kingdom (UK) is launching a study to see if giving people different Covid vaccines for their first and second doses works as well - or better than - the current approach of using the same jab twice.
Scientists have pointed out that Ebola immunisation programmes involve mixing different jabs to enhance protection.
The Com-Cov study, run by the National Immunisation Schedule Evaluation Consortium, will involve more than 800 volunteers over the age of 50 in England.
Those not involved in the trial will continue to receive the same vaccine at both appointments.
