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Following a bout with COVID-19, Erick Silva had a scary experience in 2021 that led to his decision to retire from MMA.      Related StoriesEx-UFC fighter Erick Silva confirms MMA retirement, says heart attack was 'decisive point' to end career - EnclosureBrandon Moreno reacts to praise from Conor McGregor, Dana White: 'It's well appreciated and special'Ottman Azaitar vs. Matt Frevola rebooked for UFC 281 – after 'bag of potatoes' incident canceled first fight