Volume 25, Number 3—March 2019
Dispatch
Genomic Analysis of Cardiac Surgery–Associated Mycobacterium chimaera Infections, United States
Figure 1
![Neighbor Net splitstree of Mycobacterium chimaera isolates: relationships between M. chimaera isolates (n = 124) mapped against the M. chimaera strain CDC 2015–22–71 heater–cooler unit (HCU) reference genome (18,190 single nucleotide polymorphisms [SNPs] in 3,815,639 core positions). Isolates were grouped with a threshold of <500 SNPs to the nearest cluster. Clustered HCU isolates, including the reference strain CDC 2015-22-71, comprise the HCU1 cluster (n = 112) and HCU2 (n = 3). Unclustered](/eid/images/18-1282-F1.jpg)
Figure 1. Neighbor Net splitstree of Mycobacterium chimaera isolates: relationships between M. chimaera isolates (n = 124) mapped against the M. chimaera strain CDC 2015–22–71 heater–cooler unit (HCU) reference genome (18,190 single nucleotide polymorphisms [SNPs] in 3,815,639 core positions). Isolates were grouped with a threshold of <500 SNPs to the nearest cluster. Clustered HCU isolates, including the reference strain CDC 2015-22-71, comprise the HCU1 cluster (n = 112) and HCU2 (n = 3). Unclustered isolates include Australian (AUS) HCU isolates (n = 2), USA non-HCU isolates (n=8), and the type strain FI-01069. Scale bar indicates SNPs.
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