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#Analysis of recent #scientific #information on #avian #influenza A(#H7N9) virus - 10 February 2017 (@WHO, edited)

  Title : #Analysis of recent #scientific #information on #avian #influenza A(#H7N9) virus - 10 February 2017. Subject : Avian Influenza, ...

9 Mar 2017

#Asian #Lineage #Avian #Influenza A (#H7N9) Virus as of March 8 2017 (@CDCgov)

 

Title: #Asian #Lineage #Avian #Influenza A (#H7N9) Virus as of March 8 2017.

Subject: Avian Influenza, H7N9 subtype (lineages circulating in China), current epidemiological situation.

Source: US Centers for Disease Control and Prevention (CDC), full page: (LINK).

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Asian Lineage Avian Influenza A (H7N9) Virus as of March 8 2017

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Language: [ English | EspaƱol ]

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Asian H7N9 Outbreak Characterization

  • Asian H7N9 virus infections in poultry in China
  • Sporadic infections in people; most with poultry exposure
  • Rare limited person-to-person spread
  • No sustained or community transmission

What's New & Updated

  • H7N9: What should I do?
    • CDC does not have any new or special recommendations for the U.S. public at this time regarding H7N9. CDC will keep you updated. Stay informed.
    • Since Asian H7N9 is not spreading easily from person to person at this time, CDC does not recommend that people delay or cancel trips to China. The World Health Organization also is watching this situation closely and does not recommend any travel restrictions.
    • CDC advises travelers to China to take some common sense precautions, like not touching birds and washing hands often. Poultry and poultry products should be fully cooked. CDC will update its advice for travelers if the situation in China changes. This guidance is available at Avian Flu (H7N9) in China.

 

Background

 

Epidemiology

  • Most human infections with avian influenza viruses, including Asian H7N9 virus, have occurred after exposure to poultry; Asian H7N9 viruses continue to circulate in poultry in China.
  • Most reported patients with H7N9 virus infection have had severe respiratory illness (e.g., pneumonia).
  • Rare instances of limited person-to-person spread of this virus have been identified in China, but there is no evidence of sustained person-to-person spread.
  • Some human infections with Asian H7N9 have been reported outside of mainland China but most of these infections have occurred among people who had traveled to mainland China before becoming ill.
  • Asian H7N9 viruses have not been detected in people or birds in the United States.

 

CDC Risk Assessment

  • While the current risk to the public’s health posed by Asian H7N9 virus is low, the pandemic potential of this virus is concerning.
  • Influenza viruses constantly change and it’s possible that this virus could gain the ability to spread easily and sustainably among people, triggering a global outbreak of disease (pandemic).
  • In fact, of the novel influenza A viruses that are of special concern to public health, Asian lineage H7N9 virus is rated by the Influenza Risk Assessment Tool (IRAT) as having the greatest potential to cause a pandemic, as well as potentially posing the greatest risk to severely impact public health.
  • It’s likely that sporadic human infections with Asian H7N9 virus associated with poultry exposure will continue to occur in China.
  • It's also possible that Asian H7N9 virus may spread to poultry in neighboring countries and that human infections associated with poultry exposure may be detected in neighboring countries.
  • It’s also possible that Asian H7N9 infections may continue to be detected among travelers returning from countries where this virus is present.
  • However, as long as there is no evidence of ongoing, sustained person-to-person spread, the public health risk assessment would not change substantially.

 

CDC Response

  • The U.S. Government supports international surveillance for seasonal and novel influenza A viruses with pandemic potential, including Asian H7N9.
  • CDC is following this situation closely and coordinating with domestic and international partners.
  • CDC takes routine preparedness actions to counter pandemic threats as they are identified, including developing candidate vaccine viruses (CVVs) to use for vaccine production in case vaccine is needed.
  • CDC has prepared a risk assessment of Asian H7N9.
  • Other routine preparedness activities include ongoing review of new viruses and virus sequences to assess their genetic and antigenic properties as well as their antiviral susceptibility.
  • This information informs an ongoing risk assessment process which guides further actions.
  • CDC also has issued guidance to clinicians and public health authorities in the United States, as well as provided information for people traveling to China.
  • CDC will provide updated information as it becomes available.

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Keywords: US CDC; Updates; China; H7N9; Avian Influenza; Human.

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