PBS News Hour

How extreme heat is contributing to a U.S. blood shortage

The American Red Cross says there’s an emergency shortage of blood for transfusions. In July, the national supply dropped by more than 25 percent. The Red Cross says the only solution is more blood donors. Jessa Merrill, director of biomedical communications at the Red Cross, joins John Yang to discuss.

How extreme heat is contributing to a U.S. blood shortage

5m 11s

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