MIAMI (CBSMiami) – Blood centers around the country announced the high flu activity is impacting the blood supply.

Centers are looking for donors with all different types of blood, but right now there’s a critical shortage of O negative blood.

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O negative is known as the universal blood type.

January is typically a slow month, but in some places it’s even slower because of the high-activity flu season.

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Officials said some blood centers around the country only have a three-day supply of O positive and negative blood.

“We would like 7 to 10 days’ supply sitting on the shelves,” said Angela Monteagle with the New York Blood Center. “That makes sure we are prepared for any tragedy and emergency.”

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Blood centers remind everyone who can donate that it takes less than an hour and one pint of blood can save up to three lives.