The is taking the US outbreak 'very seriously' amid growing fears the virus could jump to humans and cause an epidemic.A farm worker in became the second American ever to be infected with the H5N1 strain this week after catching it from an infected cow — also the first time that bird has been found in cattle.Mandy Cohen, the agency's director, told NPR that officials were 'monitoring the situation very closely' as farms in six states struggle with outbreaks on dairy farms.
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