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Core genome phylogeny of all Streptococcus pyogenes M1 isolates sampled from invasive infections with available whole genome sequencing data, Denmark, January 2018–February 2023 (n = 251)
Clades corresponding to the M1DK and M1UK lineages are indicated in lighter shades of blue. Sampling time is indicated in green shades at tips, with darker green indicating more recent samples. Seasons are defined starting 1 July and ending 30 June. Isolates positive for speC are marked with yellow.
