On a scorching summer day, dozens of farm laborers paused their work picking banana peppers in a remote field 26 miles from Fresno and filed into a pop-up medical clinic. It was a chance to pick up medication and take basic health assessments, such as blood pressure and glucose monitoring.

For almost a decade, the University of California San Francisco has been fielding mobile clinics like this one in rural Fresno County to support a hard-to-reach population of unauthorized immigrants who otherwise would avoid routine health care.

The program gathered steam through the COVID-19 pandemic and during California’s decade-long expansion of health care to immigrants who are in the country without authorization. But this year, doctors are starting to notice that laborers aren’t showing up f

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