Gain of function is not a "likely" cause of Covid 19. "Unlikely" would be a better descriptor. It's possible at best. There has been conjecture about virus fea

Gain of function is not a "likely" cause of Covid 19. "Unlikely" would be a better descriptor. It's possible at best. There has been conjecture about virus features showing signs of being engineered, but none of that has survived peer review. And even if the lab leak conjecture is true, that doesn't mean gain of function was involved. There are more details in this article: https://newrepublic.com/article/171012/lab-leak-covid-gain-of-function https://newrepublic.com/article/171012/lab-leak-covid-gain-o... There simply isn't sufficient evidence to support the idea that gain of function was a likely cause.