You see, all of these sars-cov-2 vaccines are "leaky" on purpose. The plan is to exploit the Marek effect and use the vaxxed population to breed a hypervirulent sars-cov strain in them. In theory, people with the vax will not be affected by this strain they hope to conjure, whilst people without the vax will die rather quickly. Making it a necessity for everyone to get the vax, on a regular basis. 100 social credit points = 1 shot, good for 30 days. And if you don't refresh, you simply die a horrible death.
Safe and effective. This system is likely going to replace fiat money as a form of control and it will be extremely difficult to avoid.