UPPER EAST SIDE — Hunter College's third-floor cafeteria was shuttered by the city's Health Department for "vermin activity" Wednesday.

Inspectors at the eatery discovered evidence of mice, according to a Health Department spokeswoman.

Students and faculty received an email from Chief Operating Officer Len Zinnanti just after 6 p.m. Wednesday telling them the eatery had been shuttered.

"Due to certain violations found in our 3rd floor cafeteria by the New York City Board of Health, the cafeteria will be closed effective immediately," read the notice, which was accompanied by a yellow sign posted on the eatery's door.

"Notice: Closed by order of the Commissioner of Health and Mental Hygiene," it read, according to photos tweeted by students, as well as staff and faculty at the school.

The college did not immediately respond to emails and calls for comment.

Students took to social media sites to air their frustrations about the closure — though many didn't sound surprised. Students and faculty at the school have long complained about rodent problems, many said.

"LOL at Hunter college cafeteria closing down for health code violations. Anyone even surprised by this? # CUNYFail," tweeted @prancingpapio

Others were less amused.

"Just got an email from Hunter saying the cafeteria will be closed due to violations found by the Board of Health...excuse me while I gag." tweeted @danielle_lauro.

"Hunter must be OD dirty 'cause they just shut down our cafeteria smfh," added @MUA_Wendy.

Zinnanti said in the notice that the school is working quickly to "correct any problems" and hopes to reopen the cafeteria as early as Thursday.

In the meantime, the school's west lobby coffee bar and eighth-floor faculty and staff cafeteria will be open to the whole school community.

The cafeteria had previously received an "A" grade, the Health Department spokeswoman said.