Johan Carlson said keeping messages clear and consistent and getting the public to take personal responsibility helped limit spread of the virus.
The majority of the lower 48 had "above" to "much above" average temperatures this summer.
The U.K., France, Belgium and several other countries in Europe are "reporting community transmission," according to the World Health Organization.
The Native American territory has 9,903 confirmed cases, with 7,154 patients reportedly recovered.
AstraZeneca said illnesses will happen by chance in trials and must be independently reviewed.
Dr. James Gill of Warwick Medical School said the decision "should be championed as good science and great transparency."
Texas schools are not required to teach any form of sexual education, but those that opt-in will be required to promote abstinence-only guidelines as well as a complete evasion of any LGBTQ discussion.
"There are few places children go where a gun is not far away," study co-author Dr. Michael Nance told Newsweek.
India is now the second worst affected country, with over 4.2 million cases.
But Professor Ian Jones of the University of Reading told Newsweek the claim "is a little stretched."
More than 14 million cases have been reported in the region, some 52 percent of the worldwide total.
Polls suggest more than half of Americans disapprove of Trump's response to the crisis.
Researchers reviewed evidence on protests and unrest around the time of 57 epidemics between the Black Death in the 1300s and the Spanish Flu pandemic of 1918.
Jeremy Farrar, director of the U.K.-based research-charity the Wellcome Trust, said political leaders are giving "false hope" over vaccine candidates.
New infections have been increasing in France, Italy, Hungary, Croatia and Estonia in recent weeks.
Nearly 50,000 spectators are reportedly expected at a pro-Trump boat parade in San Diego Bay, among several others taking place this weekend.
A recent peer-reviewed study shows that Russia's vaccine creates an immune response with no negative side effects.
Experts told Newsweek they feared cases and deaths could rise if people let their guard down as they celebrate.
At least 957 positive cases among students as well as 26 among faculty and staff have been reported, the university confirmed.
Experts not involved in the study said the results were encouraging, but more research is needed to prove its efficacy.