I thought they already stated this, they called it super immunity. Tons of articles if you Google “super immunity” covid. >Breakthrough COVID cases may supercharge immunity, study hints https://www.livescience.com/breakthrough-covid-infection-immunity-boost >**Breakthrough infections generate ‘super immunity’ to COVID-19, study suggests COVID-19 vaccination provides a foundation of protection that’s enhanced by breakthrough infection; ‘the key is to get vaccinated’** https://news.ohsu.edu/2021/12/16/breakthrough-infections-generate-super-immunity-to-covid-19-study-suggests