CNN - The Covid-19 variant KP.2 has become the dominant strain in the US in recent weeks, according to the CDC. The variant is part of the broader Omicron family — which caused the last wave of cases in the winter — but does not appear to result in more severe disease. Between April 28 to May 11, nearly 30% of new cases in the US were caused by KP.2, up from less than 16% in the two-week period before that. Health experts say the mutations of this variant threaten increased transmissibility and a possible summer wave because existing vaccines may not be as effective. Covid-19 is also settling into some seasonal patterns, which have included a summer bump in years past, but the exact level of risk for this year is unclear.
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