H7N9 flu

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H7N9 flu

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Just days after authorities in China announced they had identified cases of H7N9, flu experts in laboratories across the world are picking through the DNA sequence data of samples isolated from patients to assess its severity.

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China's National Health and Family Planning Commission confirmed that 16 people had been infected with the new H7N9 flu, with six deaths.

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The World Health Organization (WHO) says the cases of H7N9 are 'of concern' because they are the first in humans. "That makes it a unique event, which the World Health Organization is taking seriously," the Geneva-based United Nations health agency said today.

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Flu viruses are classified based on two types of protein found on their surface, haemagglutinin and neuraminidase, which are abbreviated to H and N. So far, this lack of human-to-human transmission also appears to be a feature of the H7N9 strain.

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Other strains of bird flu, such as H5N1, have been circulating for many years and can be transmitted from bird to bird and bird to human, but not from human to human.

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Although it is very early days, scientists says initial analysis also suggests H7N9 does not appear to make birds particularly ill - in other words it is what is known as a low pathogenic avian influenza, of LPAI.

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One of the world's top flu experts, Ab Osterhaus, from the Erasmus Medical Centre in The Netherlands, says the sequences show some genetic mutations that should put authorities on alert and entail increased surveillance in animals and humans.

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(Source: myechinese.com)

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