This was Van Aert's second stage win in the race, after the Jumbo all-rounder had also triumphed in stage five.
There was no shower on site, and people were asked to leave the scene as soon as possible after reaching the finish line.
"A second test will be carried out within 72 hours and then another every five days as long as they remain in the tournament," he added.
"The pandemic really has affected us tremendously. But I have not wasted my time. Instead, I kept improving my techniques. I was ready for this competition," he added.
Ricciardo finished sixth ahead of Hamilton, whose late-race charge also saw him take the bonus point for fastest lap.
The remaining of the match have been controversial as Gao Lin was shown his fourth yellow card of the season in the 71st minute after complaining to the referee. The Chinese international is going to miss Shenzhen's next match against his former club Guangzhou Evergrande next Wednesday. Enditem
In a rematch of their 2020 Australian Open quarterfinal, the second seed recovered from a 4-2 deficit in the opening set to overcome Jabeur. It's the first time Kenin has reached the fourth round at the US Open.
Slovenia's Roglic arrived with the leading group to remain 21 seconds ahead of defending champion Egan Bernal on the overall standings.
Other clubs are expected to follow.
"I don't think I have ever gotten defaulted yet in my career or in my life. No, I haven't been in a situation like that. But as I said, it's very unlucky, very unfortunate," Zverev added.
PARIS, Sept. 4 (Xinhua) -- Belgian cyclist Wout Van Aert won the 7th stage of the 2020 Tour de France, a 168km ride from Millau to Lavaur, on Friday.