The U.S. government’s first look at the real-world use of COVID-19 vaccines found their effectiveness was nearly as robust as it was in controlled studies. The two vaccines available since December — Pfizer and Moderna — were highly effective at 90% after two doses, the CDC reported Monday. In testing, the vaccines were about 95% effective in preventing COVID-19. … The study is the government’s first assessment of how the shots have been working beyond the drugmakers’ initial experiments.