Highly-pathogenic avian influenza returned to Utah, resulting in the culling of 1.8 million chickens on one farm in Cache County.
For comparison, there are about 24.6 million laying hens in Ontario.
There was another recent outbreak that affected 62,800 birds in California, the first outbreak in that state since January.
Avian influenza has also infected the sixth person stricken in the United States; he was working with dairy cattle.
