Being up to date on COVID-19 vaccines means having had three or four doses of the same shot at this point. Current boosters are the same formulations as the first authorized shots, based on the original strain of the coronavirus that emerged in late
transmission in a series of contagion waves every four to seven months.
overtook alpha and then dominated transmission until it was displaced by the omicron variant at the end of 2021.There's no reason to think this trend won't continue. In the coming months, the world may see a dominant. And it's certainly possible a new variant will emerge from a nondominant pool of SARS-CoV-2, which is how omicron itself came to be.
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