Title: China, low risk to sustained human-to-human transmission of H7N9 influenza virus so far, WHO experts.
Subject: Avian Influenza, H7N9 subtype, human cases and poultry epizootics in China.
Source: China.com, full page: (LINK). Article in Chinese, edited.
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WHO experts: H7N9 Avian influenza virus: low risk of sustained human-to-human transmission at this time
Published: 2017-03-02 13:37:39
Xinhua News Agency, Geneva, March 1 (Reporter Zhang Miao) World Health Organization "Global Influenza Project" head Zhang Wenqing 1 day in Geneva informed China H7N9 avian flu epidemic of the latest situation, pointed out that the current epidemic of H7N9 virus showed new features, but overall the risk of human-to-human transmission is low.
Zhang Wenqing said at a press conference held at WHO headquarters that the organization is closely following the fifth wave of infection with H7N9 avian influenza. From October last year to date, China reported to WHO that 460 cases of laboratory-confirmed cases of H7N9 avian influenza virus, accounting a third of all cases reported since 2013.
Zhang Wenqing pointed out that the influenza virus is evolving, causing influenza to become a continuing and important public health threat, and WHO is closely monitoring. In this wave of H7N9 epidemic, such as sex ratio, exposure history, mortality, the median age of infected persons and other people infected with the virus characteristics remained similar to the previous waves, but H7N9 avian influenza virus showed two new features.
First, monitoring revealed that the H7N9 avian influenza virus had a genetic marker associated with resistance to "neuraminidase inhibitors" in approximately 7% of human infection cases, a slight increase that was earlier than the previous year.
Zhang Wenqing said, as a class of antiviral substances, "neuraminidase inhibitors" for influenza virus treatment. Since 2013, almost all anti-viral substances have the ability to resist avian influenza virus from human cases.
Second, based on influenza data collected worldwide, the H7N9 avian influenza virus has changed in the last 3 cases of human infection and 1 case of environmental samples. These changes mean that the H7N9 virus is "highly pathogenic" to poultry Causing serious illness in poultry. Previously, the H7N9 virus was "low pathogenic" to birds, ie the virus did not cause a perceived infection in poultry.
However, Zhang Wenqing said that the virus pathogenicity changes only apply to poultry, with no evidences of such changes even for humans. There is currently no evidence that these changes in the H7N9 avian influenza virus affect the pathogenic and infectious properties of human infection.
Zhang Wenqing pointed out that the H5N1, H5N2, H5N3, H5N5, H5N6 and H5N9 viruses in avian influenza virus H5 subtypes continue to spread in poultry in the H7N9 epidemic, and the risk of H5 subtype sustainability is still low.
Zhang Wenqing said that WHO's prevention and control of avian influenza virus has not changed, the public should be avoided as far as possible contact with poultry farms and live poultry market, do not enter the area of slaughter of live birds, to avoid contact with poultry or other animal excreta Item surface. In addition, individuals should follow a good hand hygiene cleaning and food safety regulations, use soap to wash their hands, cough or sneeze when the mouth and mouth, cooking poultry meat, eggs and eggs when cooked completely cooked.
Keywords: China; H7N9; Avian Influenza; China; Human; Poultry.