A young California man is warning healthy Americans not to ignore alarming symptoms after he was diagnosed with lethal sepsis , despite being ultra-fit. In late April, Joe DuPont, 28, noticed red blotches dotting his neck, chest, and other parts of his body. At first, Mr DuPont, who is regularly active, assumed that the fast onset rashes were just a normal skin reaction. But when the spots failed to heal after a day and started oozing, he grew concerned. 'When I realized that it just wasn't going away, that's when I went to the hospital,' Mr DuPont, who works on the business side of the clinical lab industry, told DailyMail.com. The worst of it on the left side of his neck was filled with pus and fluid and continued opening up more.?On April 29, doctors at the local hospital, however, dismissed the symptoms as anxiety and a skin infection, prescribing steroid cream and oral antibiotics. It was a critical mistake as, less than 24 hours later, Mr DuPont suffered a life-threatening cardiac event as a result of sepsis, an immune system overreaction that kills one American every 90 seconds.