The third-grade teacher was reported to have died two weeks after the school announced a student tested positive for the virus.
Professor Paul Hunter of the University of East Anglia's Norwich School of Medicine told Newsweek "you cannot give the all clear for at least a couple of weeks, especially for someone in their 70s."
Regeneron Pharmaceuticals, the creator of the antibody cocktail given to President Trump as part of his COVID-19 treatment, says the company also reached out to former Vice President Joe Biden to offer him the treatment as well.
World Health Organization officials announced Monday that 10 percent of the world's population has likely been infected with coronavirus.
Doctors said they could find "no clear reason" for the prolonged viral shedding in the 78-year-old.
The president's medication includes the anti-inflammatory steroid dexamethasone, a monoclonal antibody therapy and the antiviral drug remdesivir.
The drugs the president has been prescribed have also prompted questions about the severity of his condition.
"I can't be locked up in a room upstairs and totally safe," Trump said.
Neither candidate is projected to have major cognitive functioning challenges now or over the next four years.
"If this virus can get into the body of the president, there is no place that it can not possibly infect one of our fellow Americans," the Florida congressman said Friday on Fox News.
Around 40 percent of those currently hospitalized were reported to be in ICU on Thursday.
National Security Adviser Robert O'Brien, Ohio Representative Jim Jordan and several White House officials reportedly traveled with Trump's senior aide before her diagnosis.
The university teacher in Belgium resumed the in-person lesson "to allow the students social contact."
"Voters who aren't wearing masks could put public health at risk,' said Mississippi Representative Jeramey Anderson.
The president announced that he had tested positive for the coronavirus in a tweet on Friday—just days after the first debate.
The White House medical team and I will maintain a vigilant watch," Sean Conley said in a statement.
The investigation comes amid fears the authorisation of COVID-19 vaccines may be politicized.
The state currently has 3,661 active coronavirus cases, health department figures show, with a total of 100 deaths reported in September.
Experts urged parents not to try the approach at home.
The Greek doctor reportedly noted "nobody responded in the 24 hours the invitation was published" on social media.
The air quality is expected to remain "unhealthy" through Friday in the Northern Zone and Eastern Zone of the Bay Area.
Almost 12,000 people from 130 countries took part in the Life With Corona poll which explored topics including vaccine nationalism.