CNN health | Scientists race to understand highly mutated coronavirus variant spotted in four countries, including the US

(CNN) — A highly mutated new variant of the virus that causes Covid-19 has countries on alert as scientists scramble to understand how far it has spread and how well our immunity will defend against it.

The new variant, called BA.2.86 and nicknamed Pirola by variant hunters on social media, has more than 30 amino acid changes to its spike protein compared with its next closest ancestor, the BA.2 subvariant of Omicron, according to Dr. Jesse Bloom, who studies viral evolution at the Fred Hutchinson Cancer Center in Seattle. –read more–