Hugh Jackman, who’s starring as Professor Harold Hill in “The Music Man” on the Winter Backyard Theater on Broadway, introduced on Tuesday that he had examined optimistic for the coronavirus.

“I simply needed you to listen to from me that I examined optimistic this morning for Covid,” Jackman mentioned in an Instagram video. “My signs are like a chilly: I’ve a scratchy throat and a little bit of a runny nostril, however I’m superb. And I’m simply going to do all the things I can to get higher, A.S.A.P., and as quickly as I’m cleared, I’ll be again onstage.”

Shortly after Mr. Jackman posted his video, “The Music Man” introduced on Instagram that every one performances could be canceled by way of Saturday. Tickets could be refunded or exchanged the place they have been bought. Performances will resume on Sunday, and Mr. Jackman will return to the present on Jan. 6.

A number of different Tony winners star in “The Music Man” alongside Mr. Jackman: Sutton Foster as Marian Paroo, Shuler Hensley as Marcellus Washburn, Jefferson Mays as Mayor Shinn, Jayne Houdyshell as Mrs. Shinn and Marie Mullen as Mrs. Paroo.

Preview performances for “The Music Man” started on Dec. 20, with opening evening scheduled for Feb. 10.

Whereas “The Music Man” has managed to remain open, different reveals haven’t. The New York City Ballet introduced Tuesday that it was canceling its remaining performances of “The Nutcracker.”

The producers of “Ain’t Too Proud,” a jukebox musical concerning the Temptations, additionally introduced on Tuesday that their present will shut on Jan. 16. The present has not run since Dec. 15, citing coronavirus circumstances. It’s planning to renew on Tuesday, Dec. 28, and hoping to run for 3 extra weeks earlier than closing for good.

Final week, the musicals “Jagged Little Tablet” and “Waitress,” in addition to the play “Ideas of a Coloured Man” introduced that they’d closed with out a lot as a farewell efficiency — all have been already on hiatus due to coronavirus circumstances amongst solid or crew.

The efforts of “The Music Man” to remain open had simply been highlighted on Thursday evening, when the actress Kathy Voytko, a swing and an understudy for Marian Paroo within the musical, stuffed in for Ms. Foster, who had Covid, on the final minute. After the present, the actress and dancer Katherine Winter posted an Instagram video of Mr. Jackman praising understudies and swings as “the bedrock of Broadway.”

“Kathy, when she turned up at work at 12 o’clock, may have performed any of eight roles,” Jackman mentioned on the curtain name. “It occurred to be the main woman. She discovered at 12 midday at this time, and at 1 o’clock she had her very first rehearsal as Marian Paroo.”

Because the coronavirus and its Omicron variant unfold, understudies and swings have gotten more important than ever: Exhibits are counting on them to step in for sick or unavailable leads.

“That is unprecedented,” Mr. Jackman continued. “It’s not solely occurring right here on the Winter Backyard, however throughout Broadway. It is a time we’ve by no means recognized.”