The warning comes after Thailand announced it would allow patients to get one shot each of the AstraZeneca and Sinovac vaccines to combat a current surge of COVID-19 cases. Thailand will mix the Sinovac and AstraZeneca vaccines for health workers, a move the WHO advises against. Thailand now plans to give medical staff with only one shot of the Sinovac vaccine the AstraZeneca vaccine for their second shot. The Pfizer and Moderna vaccines are the two available vaccines that use mRNA technology. The goal is to find if there are any potential benefits to mixing and matching different vaccines.
