University of Minnesota studying vaccine impact of COVID-19 spread in young adults Minneapolis Star TribuneDelta variant threatens hard-won COVID-19 gains worldwide | DW News DW NewsARIZONA Health Experts: Delta variant spreading as warned ABC15 ARIZONA ABC15 ArizonaDelta variant prompting a shift in behaviors to keep virus in check WWLP-22NewsWhat Kenya needs to do better as it braces for fourth wave of COVID-19 The Conversation AfricaView Full Coverage on Google News