In temperate zones of the Southern Hemisphere, countries are not reporting increases in influenza activity above epidemic thresholds, or unusually early influenza activity.

在南半球温带地区，各国未发现流感活动增至超出流行阈值的程度或出现过早流感活动。

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Influenza surveillance will play an important role in influenza control and epidemic predicting.

做好流感监测对控制流行与预测有重要意义。

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Objective To understand the situations of influenza epidemic as well as the aberrance of the surface proteins antigenicity of influenza virus.

目的了解流感流行和流感病毒毒株表面抗原性变异情况。

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The H7N9 strain has lead to the usual concerns about the virus causing a deadly influenza epidemic in China.

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Her husband died as a young man in the influenza epidemic of 1918.

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Setbacks on this scale have not been seen in the U.S. since the Spanish influenza epidemic of 1918, according to demographers.

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