Ученые из Кембриджа обнаружили три штамма коронавируса (A, B, C). Тип А, исходный вирус, обычно встречается у жителей США и Австралии. Но эпидемию в Ухане вызвал тип В - "дочерний штамм" типа А. Тип C, "дочерний штамм" типа B, уже возник за пределами Китая и встречается в основном у жителей Европы. 

Дональд?

This is a phylogenetic network of SARS-CoV-2 genomes sampled from across the world. These genomes are closely related and under evolutionary selection in their human hosts, sometimes with parallel evolution events, that is, the same virus mutation emerges in two different human hosts. This makes character-based phylogenetic networks the method of choice for reconstructing their evolutionary paths and their ancestral genome in the human host. The network method has been used in around 10,000 phylogenetic studies of diverse organisms, and is mostly known for reconstructing the prehistoric population movements of humans and for ecological studies, but is less commonly employed in the field of virology.

In a phylogenetic network analysis of 160 complete human severe acute respiratory syndrome coronavirus 2 (SARS-Cov-2) genomes, we find three central variants distinguished by amino acid changes, which we have named A, B, and C, with A being the ancestral type according to the bat outgroup coronavirus. The A and C…