U.S. drug giant Pfizer and Germany's BioNTech say their COVID-19 vaccine worked on more than 90 percent of people during a mass clinical trial. It's one of a dozen vaccines in the final stages of testing, raising hopes of an end to the pandemic. However, scientists are urging caution. How significant is this development? Presenter: Mohammed Jamjoom Guests: Oscar Alleyne - Epidemiologist and Chief of Programs and Services, National Association of County and City Health Officials Gian Gandhi - UNICEF Coordinator for COVID-19 vaccine work Ali Fattom - Vaccinologist and Vice President of Vaccine Research and Development, BlueWillow Biologics. - Subscribe to our channel: aje.io/AJSubscribe - Follow us on Twitter: twitter.com/AJEnglish - Find us on Facebook: www.facebook.com/aljazeera - Check our website: www.aljazeera.com/ #AlJazeeraEnglish #InsideStory #COVID19

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