(VOVWORLD) - The UK Health Security Agency on Friday designated a sub-lineage of the dominant and highly transmissible Omicron coronavirus variant as a variant under investigation, saying it could have a growth advantage, Reuters reported.
 The image shows mutations of the Omicron (right) and Delta (left) variant. Illustration: AFP/VNA
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BA.2, which does not have the specific mutation seen with Omicron that can help to easily distinguish it from Delta, is being investigated but has not been designated a variant of concern.
Britain has sequenced 426 cases of the BA.2 sub-lineage, and the UKHSA said that while there was uncertainty around the significance of the changes to the viral genome, early analysis suggested an increased growth rate compared to the original Omicron lineage, BA.1.
UKHSA said that 40 countries had reported BA.2 sequences, with the most samples reported in Denmark, followed by India, Britain, Sweden and Singapore.