The BA.2 sub-variant of Omicron has been found in five African countries, a World Health Organisation scientist said on Thursday, adding she was concerned about the development.

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"BA.2 has been reported in five countries, that is Botswana, Kenya, Malawi, Senegal as well as South Africa," Dr Nicksy Gumede-Moeletsi told an online media briefing."We are very concerned," she said.