China has detected a change in the H7N9 avian influenza virus that is capable of causing severe disease in poultry and requires close monitoring, the WHO said on Tuesday.
Samples of the virus taken from two infected humans were injected into birds in a laboratory and became “highly pathogenic” for poultry, it said.
That designation applies only to birds, not humans, WHO spokesman Christian Lindmeier said, adding that there is “no evidence that the changes in the virus affect the virus’ ability to spread between humans.”
A total of 304 new laboratory-confirmed human infections were reported in China between Jan. 19 and Tuesday last week, along with 36 deaths, the WHO said in its latest update on Monday.
The change to the virus might mean that the disease will become more apparent in some flocks if birds begin to die off, making detection and control easier.
“This is the first time these changes have been detected. These are the only two cases in Guangdong Province, China. So far, there have been no reports if similar changes have occurred elsewhere,” Lindmeier said. “It is a reminder that we have to keep looking closely.”
Animal health experts say bird flu infection rates on Chinese poultry farms might be far higher than previously thought, because the strain of the deadly virus in humans is hard to detect in chickens and geese.
In all, since the “fifth wave” of the virus — first identified in 2013 — began in October last year, 425 human cases have been recorded in China, including 73 deaths officially reported by authorities, according to WHO figures.
“Most of these cases had known exposure to poultry or its environment, that is the main important link to this influenza type,” Lindmeier told a news briefing.
In all since 2013, there have been 1,200 laboratory-confirmed cases in China, including more than one-third since October, he said.
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