http://www.newsweek.com/natural-covid-immunity-delta-variant-protect-vaccines-1635216 > As the Delta variant continues to account for the vast majority of cases of COVID in the United States, Google Trends data shows users are asking if natural immunity could protect against what is proving to be the most virulent strain of the virus. > The U.S. Centres for Disease Control and Prevention (CDC) currently estimates that the Delta variant is behind as much as 99.8 percent of the country's total COVID cases.