"This is a reminder that any employee who has tested positive will be quarantining and following all of our mandatory guidelines before they enter any of our buildings".
"I've tested negative three times now and I'll be doing the show from home this week", he said.
The infected person was on a flight chartered to transport Fox News employees returning to NY from the Thursday night presidential debate in Nashville.
Baier and MacCallum have been expected to co-anchor the network's election night coverage from the Manhattan studio next week.
Fox News has confirmed that it is dealing with a coronavirus outbreak that could sideline members of its election night team. "We will have enhanced testing procedures in place and increased safety protocols have been instituted throughout all our buildings since the pandemic".
Baier, speaking on colleague Brian Kilmeade's radio show on Monday, said all precautions are being taken.
The network will be "operating virtually wherever possible" this week, Fox News Media CEO Suzanne Scott and president Jay Wallace said in a Monday morning memo to staffers.
The network has been steadfast in taking measures to halt the spread of the virus, like wearing face masks, maintaining social distancing and receiving regular Covid-19 tests. Fox News declined to offer information about specific employees, and has cited a need to keep private health information confidential.
"Fox News Sunday" anchor Chris Wallace recently moderated the first debate in close proximity to President Donald Trump, who announced his COVID-19 diagnosis a few days later.
Among those to quarantine are Wallace, Baier, MacCallum, Dana Perino, and Juan Williams, who were all tested by the network and the Commission on Presidential Debates before they attended the debate.
USA economy bounces back in Q3
But spending on services likely remained weak, which would leave consumer spending at least 3.5% below its fourth quarter level. The housing market is booming: residential investment grew at a rate of 59.3 percent.
'God of destruction' coming near the Earth
If it were to hit the Earth, Apophis would strike with a force equivalent to 1,151 megatons of TNT (or 1,501,000 kilotons). Mr Tholen has been tracking the motion of Apophis in the sky since his team discovered it in 2004.