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CDPH Avian Influenza A (H7N9) Information Webpage

On April 1, 2013, the World Health Organization (WHO) reported the first known human infections with a new avian influenza A (H7N9) [H7N9] virus in China. No cases have been reported in the United States. So far, the virus is not known to spread easily from person to person. We are following the situation in China closely and will provide updates as new information becomes known.

Many people travel between China and California, so suspect cases of H7N9 may be found in ill people returning from China. Health care providers should test people who meet the following clinical and exposure criteria for H7N9 virus infection:

Clinical Illness Criteria:

  • Patients with new-onset severe acute respiratory infection requiring hospitalization AND;
  • Patients for whom no alternative infectious etiology is identified.

Exposure Criteria:

  • Recent travel (within ≤ 10 days of illness onset) to a country where human cases of H7N9 have been detected; OR
  • Recent close contact (within ≤ 10 days of illness onset) with a confirmed case of human infection with H7N9 virus.

Health care providers should notify their local health department about any suspect H7N9 cases. At this time, all suspect cases of H7N9) should be tested by a California public health laboratory.

For more information on testing patients for H7N9 infection, please see the CDC guidance at: http://www.cdc.gov/flu/avianflu/h7n9/specimen-collection.htm.  

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Last modified on: 1/31/2014 8:35 AM