As COVID-19 vaccines reach final testing stages, a US advisory panel released a draft plan Tuesday for how to ration the first doses.
Neither uses the actual coronavirus. Instead, they’re made with the genetic code for the aptly named “spike” protein that coats the surface of the coronavirus. Inject the vaccine containing that code, called mRNA, and the body’s cells will make some harmless spike protein — just enough for the immune system to respond, priming it to react if it later encounters the real virus.
China’s government authorized emergency use of CanSino Biologics’ adenovirus shots in the military ahead of any final testing.Making vaccines by growing a disease-causing virus and then killing it is a tried-and-true approach — it’s the way Jonas Salk’s famed polio shots were made. China has three so-called “inactivated” vaccine candidates against COVID-19 made this way.
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