2021-09-30-世界卫生组织-Influenza_at_the_human-animal_interface_summary_and_assessment,_1_October_2021_7页_245kb

报告摘要

Influenza at the Human-Animal Interface Summary (Aug 9 - Oct 1, 2021)

New Infections

Reported cases between August 8 and October 1, 2021:

Avian Influenza A(H5N6): 11 human cases from China
Avian Influenza A(H9N2): 3 human cases from China
Influenza A(H1N1)pdm09 (Variant): 5 human cases from China
Influenza A(H1N2)v: 6 human cases (5 from USA, 1 from Austria)

Also reported during consultations:

A(H5N6): 1 new case
A(H9N2): 1 new case
A(H1N1)pdm09 (Variant): 4 new cases

Risk Assessment

Avian Influenza Viruses

A(H5N6)

Overall risk unchanged.
Cases are predominantly sporadic, linked to contact with infected poultry or markets.
Very low risk of sustained human-to-human transmission; disease fatality rate remains significant.
Travelers could introduce infection, but community spread is unlikely without sustained transmission.

A(H7N9)

No recent reports of human infections from animal sources.
Overall risk assessment unchanged.

A(H9N2)

Additional human cases expected due to ongoing poultry circulation.
Low risk of human-to-human transmission.
Travelers could introduce infection, but community spread is unlikely.

Swine Influenza Viruses

All virus subtypes (H1v, H1N2v, H3v) continue to cause sporadic human infections.
On occasion, cases of mild to severe disease occur, sometimes within families.
Risk of sustained human-to-human transmission of these viruses remains low.
Travelers could introduce infection, but community spread is unlikely.

Risk Management

WHO does not advise special traveler screening but recommends:

Avoiding contact with farm animals and live markets.
Maintaining good hand hygiene.
Reassurance about routine trade is based on continued OIE guidance.
Ongoing global surveillance is critical to detect changes associated with circulating influenza viruses.
Vigilance and collaboration between animal and human health sectors are essential.
Planning for the upcoming influenza season and unexpected emergencies should be maintained, especially during the COVID-19 pandemic.

Key Links

WHO Human-Animal Interface Webpage
WHO Protocol to Investigate Unseasonal Influenza and Other Emerging Acute Respiratory Diseases
WHO Bird Flu A(H5N1) Statistics
WHO H7N9 Information
WHO Food Safety Issues for Avian Influenza
OIE Webpage: Avian Influenza
FAO Webpage: Avian Influenza
OFFLU Database

展开完整摘要