Fox News
By Ronn Blitzer – August 1, 2021
National Institute of Heal Director Dr. Francis Collins said that the coronavirus delta variant poses a new threat to the population compared to previous forms of COVID-19, and that all effective measures should be used to slow the spread, including a return to wearing masks indoors in some areas.
Speaking to “Fox News Sunday,” Collins stressed the highly contagious nature of the delta variant, while acknowledging that vaccines are generally effective against it.