The WHO is hosing down fears of another global respiratory illness outbreak following reports of mysterious pneumonia clusters in children in northern China.

On Thursday, the WHO said Chinese authorities had not detected any “unusual or novel” pathogens or presentations amidst an uptick in respiratory illnesses since mid-October.

Clusters of undiagnosed pneumonia in children’s hospitals in Beijing and Liaoning were reported by the media and the Program for Monitoring Emerging Diseases, a global disease surveillance system.

Following the WHO’s official request for additional epidemiological and clinical information, as well as laboratory results, Chinese authorities attributed the pre-winter spike to circulating influenza, RSV, SARS-CoV-2, and Mycoplasma pneumoniae.