All viruses mutate over time, including SARS-CoV-2, the virus which causes COVID-19 disease.
During late 2020, the emergence of variants that posed an increased risk to global public health prompted the WHO to start characterising them as variants of interest, and the more-worrying variants of concern, to inform the response to the pandemic.
The UN health agency decided to name the variants after the letters of the Greek alphabet, to avoid the countries that first detected them being stigmatised. Besides the four variants of concern, there are also five variants of interest, but Van Kerkhove said three of them -- Eta, Iota and Kappa -- were now being downgraded to variants under monitoring.
"This is really due to changes in circulation and that the variants of interest are just out-competed by the variants of concern.
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