What went wrong in Taiwan as island unravels its Covid-19 success

In 2020, Taiwan had one of the most successful Covid-19 responses in the world, and it went more than 250 days without reporting any local infections. As the island now battles its worst Covid-19 outbreak, CNN's Will Ripley speaks with Dr. Chen Chien-jen, an epidemiologist who served as vice president on on what went wrong with the island's Covid response.
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