We need a sophisticated way to track what vaccines people have received, and when, so that we are equipped to respond to changes in disease virulence in a measured and proportionate manner.
Robert Maranda, a spokesman for the Health Department, says there are no studies that assess the impact of receiving three doses of two separate vaccines.
The Germany-based company, which developed the first widely approved coronavirus shot together with U.S. partner Pfizer, aims to begin clinical trials for a "safe and highly effective malaria vaccine'' by the end of 2022.
