Side effects were mild, self-limited and lower in frequency than what has been reported for other vaccine types.
Centers for Disease Control and Prevention.
Oxford-AstraZeneca is currently studying the efficacy of a booster shoot.
Booster shots at a later date may be necessary to maintain immunity.
Paradoxically, China is via the company Fosun Pharma.
Severe Covid-19 occurred in 30 participants, with one fatality; all 30 were in the placebo group.