Peterson told USA Today Monday his 2012 season -- which featured 2,097 rushing yards and 12 touchdowns while leading the Vikings to the playoffs -- almost was derailed before it started when he went into anaphylactic shock due to a previously unknown allergy to shrimp.
The incident happened during training camp last year at the team's Mankato, Minn., facility.
"I thought I was Superman until I experienced that life-changing anaphylactic shock," he said. "I was eating lunch and gobbled down a couple of bowls of gumbo.
"Then, 15 minutes later, I'm in my dorm room resting up. My eyes started itching and my throat was swelling up.
"I could barely breathe."
Peterson said even as his throat was swelling shut he was able to call Vikings trainer Eric Sugerman, who used an EpiPen epinephrine auto injector to allow him to breathe as he was rushed to a local hospital.
Since then, he has partnered with Mylan Specialty LP -- maker of the EpiPen -- to act as a spokesman for an anaphylaxis preparedness campaign, the newspaper reported.
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