Huge sacrifices have been made by small farmers in culling their poultry flocks.

小型农场主宰杀他们的鸡群，作出了极大的牺牲。

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On present understanding, H5 and H7 viruses are introduced to poultry flocks in their low pathogenic form.

据目前所知，H5和H7型病毒以低致病形式传给禽类。

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H5N1 is the name of a bird flu virus that's commonly found infecting poultry flocks in Southeast Asia, but one that has rarely infected humans.

H5N1是一种禽流感的名称，该病毒禽流感通常在东南亚的家禽感染中屡见不鲜，但很少感染人类。

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Since first emerging in 1997 in Hong Kong, the bird flu has spread across poultry flocks in nine East Asian countries.

FORBES: A Killer Virus Spreads

In some places, at least, ruthless monitoring of poultry flocks has reduced both the avian disease and the (already rare) cases of people becoming infected.

ECONOMIST: Bird flu and public health

The countries represented at the summit pledged a co-ordinated fight against the disease and issued a declaration that mass culling of infected poultry flocks was the best way to control its spread.

ECONOMIST: Averting a global plague | The