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last mo.

Summer COVID-19 Wave Underway in 25 States Driven by Nimbus Variant

Bay Area wastewater readings in San Francisco have climbed to seasonal highs as national COVID activity remains low.

Pedestrians cross the street Broadway and walk down Columbus Avenue in the North Beach neighborhood of San Francisco. COVID-19 is once again on the rise in California, according to wastewater surveillance data and CDC estimates. 
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Covid-19 cases are rising again across parts of the US.

Overview

  • CDC models show that COVID-19 infections are growing in 25 states, signaling the start of a summer wave.
  • National wastewater surveillance data indicate that viral activity has risen from very low to low levels in the past week.
  • Sewage testing at six of nine San Francisco sites recorded COVID-19 concentrations not seen since winter.
  • Emergency department visits for COVID-19 in the Pacific Northwest and Southeast are now the highest since late winter.
  • The NB.1.8.1 Nimbus subvariant has become dominant, prompting experts to advise high-risk groups to receive updated boosters and follow preventive measures.