Researcher: Vaccine could come next spring

It could be a while to find out the effectiveness of a COVID-19 vaccine.

The lead researcher overseeing a clinical trial says that scientists won't definitely know if any of the vaccines work until next spring.

VACCINE.THE LEAD RESEARCHER OVERSEEINGA CLINICAL VACCINE TRIALSAYS...SCIENTISTS WON'T DEFINITIVELYKNOW IF ANY OF THE VACCINESWORK UNTIL NEXT SPRING.4:09 WE'RE DOING THINGS INMONTHS THAT WOULD NORMALLYHAPPEN IN YEARS.0:25 I REALLY DO THINK WE'RETALKING ABOUT GETTING THROUGHTO THE END OF THE YEAR AND INTOEARLY NEXT YEAR BEFORE WE WOULDHAVE A DEFINITIVE ANSWER..DOCTOR MARK MULLIGAN IS THEDIRECTOR OF THE VACCINECENTER...AT N-Y-U'SLANGONE HEALTH.HE CALLED A "ONE" YEAR TIMEFRAME A "BLAZING PROCESS FORVACCINE DEVELOPMENT".DOCTOR MULLIGAN SAYS...SOME STUDY PARTICIPANTS ALREADYGOT THE VACCINE THIS WEEK.WUHAN-VSTUDENTS WILL BEGIN RETURNING