Both. The 35-45 succeeded against Trump, and now the focus is on pressuring vaccinations. Since 28 is only for post-vaccinated, the gap in false positives (compared to 35-45) alone could "prove" the vaccines are effective. The WHO has also removed naturally gained immunity from the herd immunity definition, and Fauci has gone from 60-70%, to 80+%, to "We want to do as many people vaccinated as we possibly can, and not focus on an elusive number that nobody even knows what that number is."