On March 11, World Health Organization (WHO) officially characterized COVID-19 as a pandemic.

3月11日，世界卫生组织正式宣布新冠肺炎为大流行病。

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Over 17 years later, he again helped the country to fight against COVID-19, which has been declared a pandemic by the World Health Organization.

17年后，他再次帮助国家抗击被世界卫生组织宣布为大流行病的新冠肺炎。

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Can a pandemic be prevented?

大流行是否可以预防？

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But public health officials have also had to consider the risks if the public overreacts to a pandemic declaration.

VOA: special.2009.06.10

This in combination with the effects of aging and with genetic disposition in some instances, can cause a worldwide pandemic, and this is what we're currently experiencing.

某些场合中,衰退和生化影响,能引发全球性的大流行，这也是我们近来所见所闻。

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Doctor Fukuda, an acting assistant director-general, said the W.H.O.has been working with the member states to prepare for a pandemic.

VOA: special.2009.06.10

"I wouldn't say a pandemic is more likely than it was a year ago, " Fouchier said.

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Nor are these the only possible mutations that could start a pandemic, they said.

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"It says it's going to be harder than we thought" to control a pandemic, Simonsen says.

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