And during the time that takes you're suffering the consequences of a viral infection. Majormajor was replying to a comment suggesting that it might somehow hav

And during the time that takes you're suffering the consequences of a viral infection. Majormajor was replying to a comment suggesting that it might somehow have been possible to evolve the equivalent of a COVID-19 vaccine, which allows your immune system to adapt without experiencing a viral infection. What couldn't possibly work is for your body to already naturally be immune before experiencing the virus.