2022-02-28-世界卫生组织-Influenza_at_the_human-animal_interface_summary_and_assessment,_1_March_2022_6页_232kb

Summary of Influenza at the Human-Animal Interface (WHO, January 22 to March 1, 2022)

• New Human Cases: Between January 22 and March 1, 2022, WHO reported eight human cases of avian influenza A(H5N6) in China, six cases of A(H9N2), one case of variant influenza A(H1N1), and one case of variant A(H1N2). No major changes in overall public health risk were noted, and the likelihood of sustained human-to-human transmission remains low.

• Risk Assessment: The overall risk at the human-animal interface has not changed. Human infections are expected where viruses circulate in animals. No sustained transmission was confirmed for any subtype:

  • A(H5N6): Sporadic infections, detected in environments, mild to severe cases reported.
  • A(H7N9): No recent reports, but past detections indicate bird circulation.
  • A(H9N2): Cases with mild illness, no clusters or sustained transmission.
  • Swine influenza (A(H1)v): Cases in Denmark and US, mild illness, no widespread human-to-human spread.

• Risk Management: WHO emphasizes global surveillance, collaboration between animal and human health sectors, and immediate reporting of new influenza subtypes under IHR notifiable events. Travelers are advised to avoid contact with animals and contaminated surfaces in affected areas. No special travel restrictions were recommended.

• Additional Notes: All new influenza subtypes must be reported per IHR. Variant viruses are monitored, and WHO maintains vigilance amid the COVID-19 pandemic for potential pandemics.