Seventy Americans in one state are being monitored for bird flu due to ... trends now

Roughly 70 Americans in Colorado are being monitored for bird flu due to potential exposure.

The dairy farm workers will be tested for the virus if they show any symptoms, though this has not been the case so far, local health officials said.

Details about their ages, gender and conditions have not been revealed, but they all worked on a farm in the northeastern part of the state.

Only one person so far - a farmer in Texas - has tested positive for H5N1 virus but the CDC fears many more could be infected and not coming forward.

It comes as the FDA's top official revealed the agency is gearing up for a bird flu pandemic in people that could kill one in four of those it infects.

Dr Robert Califf told a Senate Committee that officials were drawing up plans to roll out tests, antiviral drugs and vaccines in the event the virus jumps to humans.

But he emphasized the risk of it spreading to people was still low, with only one person infected so far - a farm worker in Texas in March.

'This virus, like all viruses, is mutating,' he told the policymakers. 'We need to continue to prepare for the possibility that it might jump to humans.'

'[The] real worry is that it will jump to the human lungs where, when that has happened in other parts of the world... the mortality rate has been 25 percent.'

Officials in Colorado said it still was not clear exactly how or when the workers were potentially exposed, but bird flu was detected in the herd of cows in late April.

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'We're still putting the puzzle pieces together,' said Colorado's state veterinarian Maggie Baldwin in a public town hall on Zoom on May 8.

Texas had tested around 20 dairy workers with flu symptoms, with one positive test, while Idaho tested

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