Walgreens is one of many pharmacies offering flu shot vaccines this season. The chain charges $31.99 per shot.

The waiting room at Catch Up Clinic is sparse, save for a little girl in a pink sleeveless shirt darting out the door, a tan Band-Aid barely visible on her upper left arm. Located just around the corner from the Alameda County Women, Infants and Children (WIC) Program at Eastmont Town Center, Catch Up is one of several County Public Health Department clinics preparing for the arrival of the autumn’s biggest contagion challenge—the flu.

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