Enter Boston Celtics guard Marcus Smart, who used a video conference with reporters Tuesday to urge the league’s younger players to take the coronavirus seriously even if they don’t experience any symptoms. “It’s really concerning because unfortunately, those (asymptomatic cases) are the ones that (are) the problem,” Smart said. “Because you go out there and you’re asymptomatic, you don’t know it and you go to your Grandma or you have a kid and go home to your kid, your wife, she’s pregnant, you never know. “You don’t know because you don’t feel anything, so you’re like, ‘I don’t need to get tested. I feel fine.’ Then you’re spreading it and now it’s everywhere and it’s out of control even more than what it is.”