This article leaves sooo many questions unanswered.

Nancy Messonnier, a senior Centers for Disease Control and Prevention scientist who was the first U.S. official to warn of the severity of the coronavirus pandemic last year, is resigning from the agency.

Messonnier’s resignation comes two weeks after she had been reassigned within the CDC from her position heading the agency's Covid-19 vaccine task force, as first reported by POLITICO. Following her reassignment, Messonnier went on leave, which senior administration officials described as an unplanned vacation.

CDC Director Rochelle Walensky offered well wishes for Messonnier on Friday but did not elaborate further on the circumstances of her departure.

"Over this pandemic and through a many-decade career she's made significant contributions, and she leaves behind a strong force of leadership and courage in all that she has done," Walensky said during a press conference Friday.

Messonnier will join the Skoll Foundation on June 1, as the executive director for Pandemics and Health Systems, the foundation confirmed to POLITICO. She will lead the organization's work on Covid-19 and preparedness for future infectious disease outbreaks.

The Washington Post first reported Messonnier's resignation Friday morning.

Messonnier had spent more than 20 years at the CDC as a prominent respiratory disease expert. She became a central figure in the Trump administration’s chaotic early coronavirus response last February, when she told reporters the coronavirus outbreak would soon change the nation’s way of life.