Just when you thought it was safe for a holiday visit with your Auntie Mary and her fragile health, RSV and the flu reared their heads – and now Covid-19 numbers are creeping up again.

Health officials are emphasizing the availability of the protective measures, tests and treatments that they say will be key to preventing a repeat of the Covid-19 surges of the past two winters.

Case numbers are now below those of earlier waves, but about 14% of the US population is in an area that meets the US Centers for Disease Control and Prevention’s criteria for a “high” Covid-19 community level, up from less than 5% last week. New York City, Los Angeles County and Phoenix’s Maricopa County are among those areas.

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