For more than a year now, the original COVID-19 vaccines have held up remarkably well — even miraculously so — against a Greek alphabet of new variants: Alpha, Beta, Gamma, Delta. But now experts say something is changing. Since the start of 2022, the initial version of Omicron, known as BA.1, has been spinning off new sublineages — BA.2, BA.2.12.1, BA.4, BA.5 — at an alarming pace. Earlier variants did this, too. But it never really mattered, because their offshoots “had no… Source link
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