National Institute of Allergy and Infectious Diseases Director Anthony S. Fauci speaks during a task force meeting at the White House on Wednesday. (Carlos Barria/Reuters)

The Trump administration is racing to develop a coronavirus vaccine that could be fielded nationwide by January, U.S. officials said Thursday, as national stay-at-home guidance expired.

The January timeline represents a fast pace for vaccine development but still means there would be no fail-safe protection from the novel coronavirus until long after most Americans are likely to have returned to work or school and until after the November presidential election.