[ExI] AstraZeneca's Phase 3 trial

[John Clark]

The AstraZeneca Phase 3 trial of its COVID-19 vaccine has just been halted
because one individual got a severe spinal infection that may have been
caused by the vaccine. AstraZeneca used a weakened but living chimpanzee
virus similar to the common cold as a vector to get DNA into cells and make
them produce COVID-19 antigens, the Russian vaccine also uses this method
but other vaccine candidates do not use a live virus.

John K Clark
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