- Expert says vaccine key for schools WRTV Indianapolis
- States turning down Covid-19 vaccine doses as US demand declines The Guardian
- Can we reach herd immunity and how much is enough to curb COVID-19? 11Alive
- Covid-19: Hopes for ‘Herd Immunity’ Fade as Virus Hurtles Toward Becoming Endemic The New York Times
- How soon could Arizona see herd immunity 12 News
- View Full coverage on Google News
