Canadian teenager in critical condition with presumptive bird flu as U.S. official warns the virus 'seems to be gearing up for wider impact'
Briefly

"Having said that, I must caution that there is a very real possibility we may not ever determine a source," Henry added.
"This case is very concerning for a number of reasons," says Rick Bright, an American immunologist and vaccine researcher and a U.S. government health official from 2016 to 2020.
The patient was experiencing acute respiratory distress syndrome, or ARDS.
The teen, who has not been identified by name or gender, was not on a farm and didn't have any connection or contact with a poultry operation.
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