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News updated at 10:02 AM IST

US health authorities announce bird flu vaccine effort

Washington, Apr 5, 2013, (AFP) : 11:34 IST

US health authorities have said they are liaising with domestic and international partners to develop a vaccine for the H7N9 bird flu virus that has killed five people in China.

With the number of confirmed infection cases climbing to 14, authorities in Shanghai have begun the mass slaughter of poultry at a market after the virus was detected there in samples of pigeon.

Noting an ongoing probe by Beijing, the Centers for Disease Control and Prevention, a US federal agency, yesterday said it was following the situation closely.

Its efforts will include "gathering more information to make a knowledgeable public health risk assessment, and developing a candidate vaccine virus."

The CDC is also "reviewing posted genetic sequencing of the H7N9 viruses and assessing possible implications in terms of the viruses' transmissibility and severity and whether existing influenza diagnostic tests need to be enhanced or new ones developed."

The World Health Organisation on Wednesday ruled out the possibility of a pandemic, stating there was no evidence H7N9 could be transmitted from human to human, unlike the more common H5N1 strain.

But health experts have emphasised the need to quickly identify the source of the virus and its mode of transmission to reduce human exposure.

The first two deaths from the virus, which had never before been seen in humans, occurred in February but were not reported by authorities until late March. Officials said the delay in announcing the results was because it took time to determine the cause of the illnesses.

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