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Commercial buildings shuttered for weeks to stem the spread of the coronavirus could fuel another grisly lung infection: Legionnaires’ disease.

Public health experts are urging landlords across the globe to carefully re-open buildings to prevent outbreaks of the severe, sometimes lethal, form of pneumonia.

The sudden and sweeping closures of schools, factories, businesses and government offices have created an unprecedented decline in water use. The lack of chlorinated water flowing through pipes, combined with irregular temperature changes, have created conditions ripe for the bacteria that causes Legionnaires’ disease, they said.

If diagnosed early, Legionnaires’ disease poses less of a health risk than COVID-19, the disease caused by the new coronavirus. Most cases can be successfully cured with antibiotics, and Legionnaires cannot be spread from human to human contact.

But as communities consider reopening, any commercial facility vacated or underutilized for more than three weeks is at risk for a Legionnaires’ outbreak, unless the water pipes are properly flushed and otherwise sanitized, health experts and government officials say.