A total of 107 M. massiliense isolates from 64 patients were previously analyzed by WGS in a population genomics study by the CO-RDP9. Isolates were collected between 2013 and 2018, and patients were associated with CF facilities in 14 US states. Based on phylogenomic analyses, only 11 of 64 (17%) patients with M. massiliense had Clone 1 isolates in the previous study9. WGS data for a subset of 41 CO-RDP isolates, including Clone1 and non-Clone 1, were included in the current study (Table (Table1).1). Clone 1 isolates in the current study include 6 isolates from 6 patients (one isolate per patient) and two isolates per patient from three unique patients. Non-Clone 1 isolates in the current study include 21 isolates from 21 patients (one isolate per patient) and two isolates per patient from four unique patients.
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