Dr. Edward Kelley在推特写.

https://twitter.com/etkelley419/status/1566037391709700096?s=12

Clearly, we don't have a "forever" #vaccine for #COVID19 yet - durability for #mRNA too low & infections too high

@Novavax

is one of set of key "next generation" vaccines rolling out that will help.

Edward Kelley, MD, PhD, is the Director of the Department of Service Delivery and Safety at the World Health Organization.