2 уже мало, надо как мин 3. А там дальше видно будет...
Antibodies triggered by Sinovac Biotech’s COVID–19 vaccine declined below a key threshold from around six months after a second dose for most recipients, although a
third shot had a strong booster effect, according to a lab study.
Indonesia and Thailand have already agreed to give a third shot from Moderna and Pfizer respectively for some people who are fully vaccinated with the Sinovac vaccine, amid concerns over its effectiveness against the more transmissible Delta variant of the coronavirus.
https://www.thaipbsworld.com/antibodies-from-sinovacs-covid-19-shot-fade-after-about-6-months-booster-helps-study/