California health data show a faint Covid uptick since late June, with levels rising at 41 of 79 wastewater sites even as statewide activity remains in the "Very Low" to "Low" range.
The increase is drawing attention because California has logged its longest quiet stretch since the pandemic began, leaving more time for immunity from prior infection or vaccination to fade before a typical summer wave.
XFG.1.1, or Stratus, is the dominant strain, but officials say it does not appear more infectious or severe than earlier variants and has already started declining in some states.
The CDC lists California among 4 states with growing Covid trends, and Bay Area wastewater concentrations were reported up 104% from June levels, though the state has not yet called the rise a full summer surge.
Separately, California said it is not seeing the national cyclosporiasis outbreak: the state logged 41 cases through June versus 80 a year earlier, with most tied to travel rather than local spread.
With Bay Area wastewater spikes signaling a hidden COVID surge, are our current tests failing to catch the XFG variant in time?
If updated vaccines primarily prevent severe illness, how can vulnerable populations truly protect themselves against this rapidly evolving summer variant?
As the Stratus strain spreads this summer, could the massive sewage spike be a false alarm or the start of a silent wave?