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New York City teachers are calling for a “mass sickout” on Wednesday in response to Mayor de Blasio’s insistence on keeping public schools open amid the coronavirus outbreak.

Twitter postings calling for the sickout started appearing Friday, with nervous teachers consulting colleagues about taking the drastic action to protect themselves and their families.

“We’ve talked about it,” one told The Post on Saturday, adding that his union chapter is holding a meeting on Monday to vote yes or not to join the sickout.

“Other teachers I know have said they will call out,” he said.

Each NYC teacher gets 10 days of paid “self-treated” sick leave without a doctor’s note.

In an appearance on MSNBC on Saturday, Mayor de Blasio stuck to his guns about keeping schools open.

Closure would cause “a cascading effect,” impacting the subways and hospitals because transit and health-care workers would stay home with kids, de Blasio said.

He also noted that hundreds of thousands of teenagers would be left unsupervised, and could be unsafe or get in trouble on the street.