Boston Celtics guard Marcus Smart is the latest NBA player to test positive for coronavirus, making the announcement Thursday on Twitter.

Smart wrote, “I was tested 5 days ago and the results came back tonight, which were positive. Ive been self quarantined since the test, thank goodness. COVID-19 must be taken w the highest of seriousness. I know it’s a #1 priority for our nations health experts, & we must get more testing ASAP”

He said in a video included with his tweet, “I’m OK. I feel fine. I don’t feel any of the symptoms, but I can’t stress enough practicing social distancing and really keeping yourself away from a large group of people. Just really washing your hands, and help protect others by protecting yourself. Thank you.”

There are now 10 confirmed positive tests for COVID-19 among NBA players, but only five of those players have been identified: Utah Jazz All-Stars Rudy Gobert and Donovan Mitchell, injured Brooklyn Nets star Kevin Durant, the Detroit Pistons’ Christian Wood, and Smart.

Three other Nets players and two Los Angeles Lakers players also tested positive.

Smart, 25, was scoring a career-high 13.5 points in 53 games (39 starts) for the Celtics before the NBA season was shut down last week after Gobert’s positive test was confirmed.

The Celtics opposed the Jazz on March 6, with visiting Utah earning a 99-94 win.

In 53 games (39 starts) in 2019-20, Smart is contributing 4.8 assists and 3.8 rebounds per contest.

A first-round pick of the Celtics in the 2014 draft out of Oklahoma State, Smart has career averages of 9.9 points, four assists and 3.6 rebounds in 394 games (182 starts). He made the NBA’s All-Defensive team in the 2018-19 season.