Beyond Delta, scientists are watching new coronavirus variants

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The continued spread of the SARS-CoV-2 virus has spawned a Greek alphabet of variants - a naming system used by the World Health Organization (WHO) to track concerning new mutations of the virus that causes Covid-19. Some have equipped the virus with better ways of infecting humans or evading vaccine protection.Scientists remain focused on Delta, now the dominant variant around the world, but are tracking others to see what may one day take its place.Delta - still dominantThe Delta variant, first detected in India, remains the most worrisome. It is striking unvaccinated populations in many countries and has proven capable of infecting a higher proportion of vaccinated people than its predecessors.The WHO classifies Delta as a variant of concern, meaning it has been shown capable of increasing transmissibility, causing more severe disease or reducing the benefit of vaccines and…