Top Adviser To Operation Warp Speed Calls An October Vaccine 'Extremely Unlikely'

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A researcher takes blood samples from a patient as she participates in a COVID-19 vaccine study last month at the Research Centers of America in Hollywood, Fla.

Dr. Moncef Slaoui, chief adviser to the administration's effort to develop a COVID-19 vaccine, said having a vaccine by next month was "not impossible." But a longer timetable appears more likely.

(Image credit: Chandan Khanna/AFP via Getty Images)