Phylogenetic analysis of NmW CC11 isolates. The ABCs 2011–15 NmW CC11 isolates were compared to fifty-one isolates (collected 1997–2015) representative of the NmW African lineages, the South American, and UK lineages described previously (7, 27, 28). The ABCs isolate denoted by the (+) was collected in 2009 and was used as a positive control. The majority of U.S. isolates cluster together and are most similar to isolates from the South American lineage. One ABCs isolate, collected from NY in 2012 and denoted by the (*), clustered with the European isolates and was most closely related to a 2012 isolate from South Africa.