Louisiana customers of the Jimmy John’s sandwich chain appear to have escaped a theft of credit card data believed stolen from 216 of the company’s shops in 37 states between June and September.

The Champaign, Illinois-based chain did not say how many customers are affected. Jimmy John’s said it believes its security has been restored by installing encrypted swipe machines and taking other steps.

Louisiana was not on the company’s website list of states where data breaches occurred. The chain operates 16 sandwich shops across the state: four in Baton Rouge; three in New Orleans; and one each in Gonzales, Lafayette, Harahan, Metairie, Covington, Hammond, Houma, Monroe and Shreveport.

At stores affected elsewhere, Jimmy John’s believes someone stole log-in credentials and remotely installed malware on machines used to swipe credit cards. Some customers’ credit card numbers, expiration dates, verification codes and names were stolen between June 16 and Sept. 15, the company said.

The privately held company said it discovered the problem on July 30.

Jimmy John’s has more than 2,000 locations.