Can a retail store deliver healthcare? Wal-Mart, the largest US retailer, thinks so, together with CVS, Walgreens and Rite Aid, the leading US drug store chains. But as all four move ahead with plans to expand “walk-in clinics” in their stores, the doctors of Illinois are fighting back.

The state could be the first to impose stricter regulation on the new generation of walk-in clinics, where nurse-practitioners can examine patients, conduct basic procedures such as inoculation, and prescribe for minor illnesses, while charging less than a doctor’s practice.