[RichDad]

ya. working.
only worked after the introduction of the SinoFac vaccine here, some may say.

More likely because of natural immunity. I think many people got it but didn't report since not sick. 

But all this will likely change with new variant Omicron. Then Sinovac and Sinopharm will perform better according to Dr Gabriel Oon because these got all the 7 antigens of the virus.

Hope for the best.