President Trump reiterated a claim that a novel coronavirus vaccine will be ready this Fall, and said on Fox Sports Radio that Democrats are “petrified” that it will emerge before Election Day. Trump’s claim went against a prediction by Centers for Disease Control and Prevention head Robert Redfield that vaccines will not be widely available until the middle of next year. Many experts, including scientists leading the vaccine effort, have agreed with Redfield.

In an interview on Fox News, White House chief of staff Mark Meadows said that attempted to discredit the head of the federal agency, saying he was “not sure where Dr. Redfield got his particular timetable, but it’s not based on those that are closest to the process.”

“It is important that we have consistent messaging from all levels” by top officials worldwide, World Health Organization emergencies chief Mike Ryan said at a news briefing on Thursday.

Here are some significant developments: