English: Maximum likelihood phylogeny of 24 complete genome sequences of MYXV. Viruses are color- coded according to virulence grade.
Grade 1: Case fatality rate: 99.5% Average survival time: less than 13 days
Grade 2: Case fatality rate: 95-99% Average survival time: 14-16 days
Grade 3: Case fatality rate: 70-95% Average survival time: 17-28 days
Grade 4: Case fatality rate: 50-70% Average survival time: 29-50 days
Grade 5: Case fatality rate: less than 50% Average survival time: not defined.
Grade 1 = red
Grades 3–4 = green
Grade 5 = blue
The tree is rooted between the two oldest strains in the collection – Lausanne (1949) and SLS (1950) – which were used to seed the European and Australian epidemics, respectively (marked by asterisks).
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