Nearly 5,000 people died in Puerto Rico following Hurricane Maria, according to a new study out of Harvard. That includes people who struggled to receive medical care due to power loss and blocked roads, or couldn’t find uncontaminated water. Dr. Irwin Redlener, a national leader in disaster preparedness, says he expects that number to climb as more studies are released. He joins Soledad O’Brien to discuss why the hurricane’s aftermath was so deadly.

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