Seattle Children’s Hospital closed several operating rooms and is contacting the families of about 3,000 children who’ve had recent procedures after a common type of mold was detected in the facility over the weekend, officials said.

Aspergillus mold was found in four of the 14 operating rooms following a routine check, hospital officials told The Seattle Times. The affected rooms will remain closed until further notice. Dozens of surgeries have been moved or rescheduled.

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“Patient safety is our top priority, and we are taking this situation very seriously,” hospital spokeswoman Alyse Bernal said in a statement.

Aspergillus is a common mold found both indoors and outdoors, according to the Centers for Disease Control and Prevention. While most people breathe in the spores every day without getting sick, the mold poses a greater risk to those with compromised immune systems or lung disease. The mold can cause allergic reactions and infections in the lungs and other organs.

While the hospital said it believes the risk to surgical patients is “extremely low,” it is contacting those who’ve had surgical procedures in the past four months, the paper reported.

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Hospital officials told KOMO News that staff are cleaning the affected areas and will work with an industrial hygienist to determine how the mold contaminated the operating rooms.

Two patients at the hospital have developed Aspergillus infections over the past year, KOMO reported. One of the patients died. Details on the cases couldn’t be shared because of health care privacy laws.