The Georgia governor was criticized for saying he didn't know "until the last 24 hours" that some infected people do not show symptoms.
American Airlines has risked the health of flight attendants and passengers by enforcing rules about riding in coach, it is alleged.
So far, COVID-19 has killed four times as many people as the Ebola outbreak of 2014, but far fewer than the swine flu pandemic in 2009.
Loeffler and her husband have come under scrutiny for dumping hundreds of thousands in stocks before the market dropped over the coronavirus outbreak.
The 2019 study blows a hole in the administration's argument that the coronavirus pandemic's damage to the economy was unexpected.