Outbreak Investigation Report on H5N2 Avian Influenza in Ontario, 2015
Summary

HPAI was identified in a meat turkey farm on April 5th, 2015. Subsequently, two other commercial farms were infected with the same virus: one broiler breeder and one turkey genetics. All birds on infected premises were humanely destroyed and composted on-site.
The virus was identified as an H5N2, a reassortant virus with the H5 from the highly pathogenic Eurasian H5N8 virus and the N2 from a North American virus.
Movement restrictions were placed on 73 farms in two clusters: 31 were located within 10 km of Infected Premises (IP) 1 and 42 were located within 10 km of IPs 2 and 3. Movement restrictions were also placed on two premises outside of these clusters due to significant contact with an IP.
The CFIA undertook a complete outbreak investigation, including an epidemiological analysis. It was determined that:
- For two infected farms, the source of the virus was contact with wild birds.
- For one infected farm, the source of the virus is suspected to be localized/environmental spread.
Surveillance was completed on 70 commercial farms from April 14th, 2015 to July 27th, 2015 with over 1,300 samples collected testing negative for HPAI virus.
Post-outbreak surveillance was completed during the period from July 8th, 2015 through October 8th, 2015 with 160 samples tested in 160 premises, with negative results.

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