CNN's Kate Bolduan asks Superintendent of Cobb County, Georgia, School District Chris Ragsdale about whether he would enforce a mandatory mask policy in his schools.

Russian President Vladimir Putin announced the approval of a coronavirus vaccine. CNN's Dr. Sanjay Gupta explains why he won't be taking it.

In an interview on ABC News' "World News Tonight with David Muir," Dr. Anthony Fauci said that he feels that universal wearing of masks in addition to other public health measures are "very important" in preventing the spread of Covid-19 as schools reopen.

21-year-old Spencer Rollyson had a mild case of Covid-19 but ended up in the intensive care unit with organ failure. He tells CNN's Erin Burnett that he initially thought coronavirus was like the flu.

CNN's Dr. Sanjay Gupta explains what factors make people likely to face severe illness, hospitalization or even death from Covid-19.

Contrary to President Trump's predictions, experts tell CNN it's unlikely there will be a coronavirus vaccine ready by Election Day. CNN's Elizabeth Cohen reports on data from Moderna, the first company to begin its Phase 3 clinical trials of a coronavirus vaccine in the United States.

Microsoft founder Bill Gates discusses why the US is still struggling to contain the spread of the coronavirus. Two of the main issues, he says, are a failure to shut down and a lag in testing capabilities.

CNN's John King breaks down the latest coronavirus numbers in the US, where cases are trending up in six states and down in 25.

CNN medical analyst Dr. Jonathan Reiner weighs in on the annual Sturgis Motorcycle Rally in South Dakota. This year's gathering is expected to draw about 250,000 people from across the country, and Reiner says it has the potential to be a "super spreader" event.

Preventive medicine specialist Dr. David Katz discusses an article in the journal Nature Reviews Immunology that suggests some immune systems are resistant to COVID-19.

In a Texas town, 75% of a prison's population tested positive for coronavirus. Hear what it's like inside the hardest-hit federal prison in the US. CNN's Drew Griffin reports.

CNN's Randi Kaye reports on the problems with the rapid coronavirus testing and what contributes to the inaccurate results.

An antibody treatment designed to protect against coronavirus could be available as early as this fall -- but only for a fraction of the millions of Americans who might benefit from the treatment. CNN's Sara Murray reports.

CNN's Sara Sidner reports that it is projected there will be 130,000 from coronavirus in the US by the end of the year as schools are starting to re-open across the country.

CNN's Brianna Keilar becomes emotional while talking about those who have died from coronavirus and the families they've left behind.

At "Camp Quarantine," Tyler Perry has brought more than 300 cast and crew members back to work with frequent testing and adherence to CDC guidelines regarding sanitation and social distancing.

Michael Phelps, the 23-time Olympic gold medalist, tells CNN's Anderson Cooper and Dr. Sanjay Gupta that keeping a routine and exercising every day has made all the difference in how he copes with the coronavirus pandemic.

Coronavirus task force coordinator Dr. Deborah Birx warned nine US cities to take steps to mitigate the spread of covoronavirus while an influential model predicts almost 300,000 US deaths by december. CNN's Athena Jones reports.

CNN's Elizabeth Cohen talks to a volunteer participating in a trial that has shown potential to both treat and prevent Covid-19.

In an interview with CNN's Brianna Keilar, Dr. Adrian Burrowes said it is reckless and irresponsible for Florida Gov. Ron DeSantis to say it is safe to hug with PPE on during the coronavirus pandemic.

During an episode of "The Michelle Obama Podcast," the former first lady revealed watching the current administration has contributed to her having "low-grade depression" during the pandemic.

Ohio Gov. Mike DeWine (R) announced that he has tested positive for coronavirus shortly before he was scheduled to meet with President Donald Trump in Cleveland.

Sturgis, South Dakota, Mayor Mark Carstensen talks with CNN's John Berman about the city's upcoming motorcycle rally that expects more than a quarter of a million people to show up, during the coronavirus pandemic.

Dr. Anthony Fauci tells CNN's John Berman that he agrees with Dr. Deborah Birx's warning about rising coronavirus positivity rates in nine US cities and the central valley of California.

CNN's Athena Jones reports that although the number of new Covid-19 cases is holding steady or falling in most states, the death toll in the US is continuing to climb.

Dr. Anthony Fauci tells CNN's Dr. Sanjay Gupta that he has had to get security protection after his family received threats and harassment.

CNN's Alexandra Field looks at the struggles homeless Americans face during the coronavirus pandemic.

Stacey Nagy told CNN's Erin Burnett she wrote an obituary for her husband's coronavirus death where she blamed President Trump, Texas Gov. Abbott and those who do not wear masks because she felt a need to "put blame where it belonged."

CNN's Erica Hill reports that Covid-19 related deaths are on the rise in 27 states as President Donald Trump continues to claim the virus is under control.