KNTV NBC Nightly News With Lester Holt June 4, 2024 22:36:00
After five months, the third boost. but for now the cdc and fda say there is still not enough evidence for boosters. that guidance expected to change as a troubling number of breakthrough infections are being reported at workplaces, vacation hot spots and among families. >> as we hear more about breakthrough cases, is there any concern about the efficacy of vaccines beginning to wane? >> i think the magic question is when will we need booster, not if we need boosters. it feels right now with the majority of americans having been vaccinated ae time. >> reporter: with more than 80,000 americans ...