Introduction . M ycobacterium abscessus , a global, non-tuberculous, rapidly-growing mycobacterium, is considered an opportunistic pathogen. Given its emerging nature and its drug-resistant profile, M. abscessus is a clinically relevant mycobacterium, especially in patients with cystic fibrosis (CF). Several recent studies have applied genomic analysis to identify whether interpatient transmission of M. abscessus between CF cases is a possibility, as an alternative explanation ...