TLR7 and COVID-19: The first study shows that men under 60 years of age with a severe or lethal form of COVID-19, about 3.5%, have mutations in the TLR7 gene at a rate of more than 1%, and these are genes that intervene with the production and operation of the entire chain linked to the interferons, resulting in a lack of this immediate molecule that enables the virus to destroy or slow down its action.