BOSTON —

For Kat Alcaide, the memory of her son's death is as painful as it was 13 years ago.

"I was holding him and they pronounced him in my arms," Alcaide said as she fought back tears. Latest Forecast

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Her son, Brady, was just 2 months old when he died.

"It was one of the hardest moments of my life," she said. "So much goes through your head at that time. Like anger, frustration, confusion, and then mom sets in. How am I going to tell my girls? How are we going to get through this?"

Brady died after contracting pertussis, or whooping cough. He was too young to be vaccinated, and the vaccine was not offered to pregnant women at that time. While Alcaide may never know exactly how he got it, the epidemiologist they worked with aft

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