China's COVID-19 vaccine has relatively good protective effect: expert

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China's COVID-19 vaccine has a relatively good protective effect, and the source of the country's recent scattered infections of coronavirus is from outside the country, Feng Zijian, deputy director of the Chinese Center for Disease Control and Prevention, said in an interview on Sunday. He also pointed out that the upcoming 40-day Spring Festival travel rush is an important step in the prevention and control of the epidemic.