Peter Attia· MD
the hot coronaviruses the cold ones cause the common cold and they're seasonal the ones that cause severe illness or the hot coronaviruses there's only been three in history and that's sars mers and covid19 now sars was studied 17 years out and the natural immunity was solid mers was studied three years out and the natural immunity was solid probably longer but that's just the time points at which they studied the viruses that no longer circulate