The BA.2 subtype of the Omicron coronavirus variant appears to have a substantial growth advantage over the currently predominant BA.1 type, Britain's UK Health Security Agency said on Friday.
UKHSA said that there was an increased growth rate of BA.2 compared with BA.1 in all regions of England where there were enough cases to compare them, and that "the apparent growth advantage is currently substantial".
The rapid spread of BA.1 fuelled an Omicron wave which pushed cases to record highs in Britain in December, displacing the previously dominant Delta variant. The UKHSA said that a separate analysis showed that between Nov 24 and Jan 19, the majority of intensive care admissions from COVID-19 had Delta infections, even as Omicron was growing to dominate the number of cases.
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