What? Of course infection induces immunity in case of covid, about on par with mRNA vaccines like Pfizer and Moderna. https://www.nih.gov/news-events/nih-resea

What? Of course infection induces immunity in case of covid, about on par with mRNA vaccines like Pfizer and Moderna. https://www.nih.gov/news-events/nih-research-matters/lasting-immunity-found-after-recovery-covid-19 https://www.nih.gov/news-events/nih-research-matters/lasting... You don't have similar immunity efficacy studies for actual covid as hou have for vaccines, because infecting people on purpose would be unethical. Note that your wording "coin flip" isn't right for Sinovac, either. 50 % efficacy is not huge but it is still beneficial on population level.