Overview
- Follow‑up genetic analysis by the National Institute for Environmental Studies confirmed influenza A in wild duck samples but found no high‑pathogenicity avian influenza on November 28.
- The Environment Ministry’s temporary surveillance designations within a 10‑kilometer radius of the detection sites were lifted on November 28 under national protocols.
- Initial real‑time RT‑PCR testing detected the influenza A M gene on November 26 with H5 negative, and next‑generation sequencing and Sanger methods later determined the absence of HPAI.
- The Tokyo Metropolitan Government said it will continue wild‑bird surveillance and information gathering given nationwide developments.
- Okinawa officials reported a migratory teal found on November 20 tested influenza A positive on November 21, with subsequent testing confirming no H5 or H7 high‑pathogenic viruses and the local designation lifted.