Officials say a Catholic school on Manhattan's Upper East Side has been closed for cleaning after a cooling tower tested positive for low levels of the Legionella bacteria.

The Convent of the Sacred Heart School on East 91st Street had been open for faculty meetings only.

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Principal Joseph Ciancaglini says the cooling system was disinfected twice by an environmental engineering firm. He says classes at the all-girls school will begin next week as scheduled.

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Department of Health officials confirmed the school's cooling tower was properly disinfected.

Recently passed legislation mandates all cooling towers across the city must be regularly tested for Legionella bacteria.

A Legionnaires' outbreak in the Bronx earlier this summer killed a dozen people and sickened more than 100.