New omicron sublineages, discovered by South African scientists earlier this month, account for about 70% of new coronavirus cases in South Africa and the strains appear to be more infectious than predecessors.
The BA.4 and BA.5 sublineages appear to be more infectious than the earlier BA.2 lineage, which itself was more infectious than the original omicron variant, Tulio de Oliveira, who runs gene sequencing institutes in the country, said on Twitter.
A rapid increase in infections in the last 2 weeks was due to BA.4 and BA.5. Albeit coming from a low number. The 6,000 infections yesterday are underestimated as the test positivity ratio is around 20%. South Africa did not have a BA.2 Omicron wave-like Europe but only a large BA.1 wave.
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