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Virtually everyone in SA had antibodies to Covid-19 by the end of the fourth wave in March, but this was not enough to stop another surge in coronavirus cases less than two months later, according to a new survey of blood donors.

SA’s fourth wave was driven by the BA.1 and BA.2 Omicron sub-variants, and was swiftly followed by another wave powered by Omicron sub-variants BA.4 and BA.5...

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