I was refering to previous coronaviruses, we have data for these and they seem to leave an immunity of one or two years https://www.sciencemediacentre.org/expe

I was refering to previous coronaviruses, we have data for these and they seem to leave an immunity of one or two years https://www.sciencemediacentre.org/expert-reaction-to-comments-made-by-dr-maria-van-kerkhove-at-the-who-that-there-is-no-evidence-antibody-tests-can-show-that-an-individual-is-immune-or-is-protected-from-the-infection/ https://www.sciencemediacentre.org/expert-reaction-to-commen... Also they study old patients and the immune system goes strong for over 8 months, showing that it can last much longer: https://science.sciencemag.org/content/371/6529/eabf4063 https://science.sciencemag.org/content/371/6529/eabf4063