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All 6 recent cases involved poultry exposure in areas far from the recent epicenter of activity.
In a review of recent cases, experts report a shorter time to ICU and death.
Japan, meanwhile, reports two large H5N6 outbreaks at poultry farms in different prefectures.
Also, Croatia reports its first high-path H5N5 outbreak in poultry.
The agency says there's still no evidence H7N9 has gained capacity for sustained spread.
Officials said the shifts haven't changed the epidemiologic or clinical patterns in people.
Also, Taiwan notes new H5N6 outbreaks, and China detects more highly pathogenic H7N9 in poultry markets.
H5N8 has now been confirmed in 40 countries, and South Korean scientists shared genetic findings from a recent H5N6 isolate.
So far there's no sign that H7N9 epidemiology is changing for humans, but for poultry, the virus has become more deadly.
China's premier urges officials in affected areas to shutter live-poultry markets.
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