Some interesting news coming from Italy and the city of Ferrara ( south of Venise in the delta of the Po river, plagued by malaria until WWII ) on natural resistance to covid among inhabitants of the City. Incidence rates are 6 times lower than in comparable cities in northern italy as per the article.
The article is in italian but you can copy paste to your favorite translator if you don't read italian
https://notizie.tiscali.it/salute/articoli/ferrara-resistenza-naturale-contagio-coronavirusSurvivors of malaria were made naturally resistant to the disease by a genetic inheritable trait known as thalassemia.
Would the same genetic character prevent the occurence of covid ? Italian scientists are already researching on the matter.
I have neved had malaria but the similarity of the malarian fever and the covid fever are striking ( coming and going and lasting for weeks ...)