[watchfirst9]

China has no choice as there are many foreign agents who are intentionally spreading the Covid virus in Chinese cities.
E.g. the recent mother-daughter pair who " 投毒 " in Hangzhou.

 The two companies should go for vaccine that can produce sufficient antibodies at the nose and respiratory end so they can exit 
A number of countries already developing it, they are not going to follow 4th or continue the endless jab.