And There's A Surprise.

It's been a failure.

http://www.news.cn/english/2021-11/18/c_1310318423.htm

Fortunately it's been such an incredible failure. It's managed to loop all the way around again and, accidentially, be of some use.

The single dose of any vaccine priming the immune system. Preventing the over-reaction of the immune system.

Which has, really, been the only concerning part about Covid.