Coronavirus: How long will it take to develop a Covid-19 vaccine? สาธารณะ

Coronavirus: The search for a vaccine is on. How long will it take to develop it?

Watch the video and answer these questions:
1. Who said developing a vaccine could take 18 months?
2. Which word describes a test to check if a vaccine is safe?
3. What makes it harder to develop a vaccine?

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