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As low as our expectations for Schools Chancellor Richard Carranza had grown long ago, we’re still appalled at his performance in the face of the coronavirus crisis.

As Susan Edelman reported in Sunday’s Post, Carranza ordered his minions to not report cases of contamination to city health authorities. His March 10 e-mail puts it plainly: “There is no reason for any school to call [the Health Department] to report potential or confirmed cases.”

The excuse was that the lab would independently send a notification — but this was plainly aimed at delaying any action.

Proof of that comes from the shocking refusal last week to take the obvious steps after several educators at Brooklyn Tech tested positive for the COVID-19 bug: The Department of Education still had all 350 staff at one of the city’s largest schools report in for work, even though Mayor Bill de Blasio had closed all schools for students.

This, though the State Education Department on March 9 ordered a complete shutdown of any infected school for at least 24 hours for an investigation of who came into contact with students or staff members with a confirmed COVID-19 case. Nor was Brooklyn Tech the only case where Carranza & Co. ignored that rule: Edelman identified several others, and it’s a good bet other cases exist.

Speculation is rife that this illegal policy was the product of Carranza’s and Mayor de Blasio’s desire to keep the city’s schools open far longer than did neighboring jurisdictions and systems in cities that face a distinctly less grave corona threat.

The mayor and chancellor “say ‘equity and excellence,’ but every other school district closed before you did. You had these kids like Petri dishes spreading this to their families,” one administrator fumed to Edelman.

Another DOE employee said of de Blasio and Carranza: “The blood is on their hands.”

We lost patience with Carranza long ago, as did many if not most of the city’s parents. This development guarantees the hostility of the city’s teachers unions, and pretty much the entire DOE staff.

The chancellor probably doesn’t have the decency to simply resign, but he’d be wise to update his resume, because he’s toast. If de Blasio doesn’t fire him, Gov. Cuomo will have to look seriously at removing the mayor.