On May 10, the World Health Organization added a new virus to its list of covid-19 variants of global concern. The variant, B.1.617, is being blamed for the runaway infections in India. It is the fourth addition to a list that also includes variants first identified in the UK, South Africa, and Brazil. “There is some available information to suggest increased transmissibility,” said Maria Van Kerkhove, WHO technical lead on covid-19, at a briefing.
