A floor trader at the New York Stock Exchange beloved by photographers for his wild, Einstein-like hair and vivid expressions has tested positive for the novel coronavirus.

"I tested positive yesterday for corona," Peter Tuchman said in a tweet on Thursday, adding that he had "been really sick for seven days." In a brief telephone interview, he confirmed he had the virus and was feeling ill but declined to comment further.

Mr. Tuchman, who is employed by brokerage firm Quattro M Securities Inc., has worked on the NYSE floor for more than three decades.

The NYSE floor has been closed and the exchange has shifted to all-electronic trading since the beginning of this week. Last week, two people at the exchange tested positive for coronavirus.