Researchers have been determined to figure out how bird flu spreads from human to human worldwide.

研究人员下决心要弄清楚禽流感在全球范围内是如何在人与人之间传播的。

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If that is true, as the flu spreads, it would not be surprising if most cases were mild.

如果这是真的，随着猪流感的传播，如果大多数感染者都属轻微症状的不足为奇。

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Why not? Most flu spreads when an infected person coughs or sneezes out droplets of irus. Ferrets infected with the altered 1918 irus didn't sneeze at all.

为什么不呢？大多数流感是在一个人感染后咳嗽或打喷嚏时放出病毒小滴进行传播。感染了发生变化的1918病毒的雪貂没有一个打喷嚏。

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"Flu spreads easily and can cause serious illness which would need to be treated in hospital, " said Dr Hussey.

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When a flu spreads, or an earthquake strikes, or cartels threaten innocent people, it affects lives on both sides of our common border.

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When the flu spreads person to person, instead of from animals to humans, it can continue to mutate, making it harder to treat or fight, because people have no natural immunity.

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