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China reports a highly pathogenic H7N9 avian flu outbreak, its first since September 2017.
The low-path H7 detection is the first in the US this year, and more tests will be done to characterize the H7N1 virus.
In South Korea, H5N6 developments in poultry prompted a move to the highest avian flu alert level.
Bulgaria and South Africa report outbreaks, and the USDA approves the first poultry DNA vaccine.
In a sample from a patient who died, researchers saw signs that the H7N9 virus had started to mutate to a form resistant to Tamiflu.
In other H7N9 developments, China's agriculture ministry this week announced plans to expand poultry vaccination to the whole country.
Cases are down from the 10 reported last week but show ongoing virus circulation in the summer.
Current viruses fall into 2 geographically separate clades.
The 10 cases, 2 of which were fatal, are an increase from 5 reported last week.
In addition, Korea, Zimbabwe, and Luxembourg note H5N8, and Libya confirms H7.
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