The organisation had been under pressure not to declare a pandemic for such a mild virus.

之前世卫组织没有宣布此温和病毒所致流感为大流行承受了巨大的压力。

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In the 1918 pandemic, the virus was relatively mild when it first appeared in the spring, but it came back with a vengeance in the fall.

1918年的那场流感大流行期间，当病毒首次在春季出现时，引起的症状相对轻微，但是到了那年秋天，它卷土重现时，却来势更猛。

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Human infections with Hendra virus range from mild influenza-like illness to fatal respiratory or neurological disease.

人类感染亨德拉病毒的症状从轻微的流感样病症到致命的呼吸道或神经系统疾病不同。

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"because the virus can spread rapidly, but what we're seeing so far is a pretty stable position as far as the virus is concerned, it's producing relatively mild illness in most people, but in a small proportion it's causing serious problems and we have in place the plans in our health care system to deal with those problems,".

VOA: standard.2009.07.31

The virus causes only a mild infection in children.

BBC: Flu vaccines for all children

Researchers are still trying to determine how easily the virus is transmitted person to person and it's too early to predict whether there will be a mild or serious pandemic, said Fukuda.

CNN: The story