They were never used at a second hospital in the Upper Allegheny Health System, Bradford Regional Medical Center in Pennsylvania, Finan said.

WSJ: 2nd NY hospital warns of insulin pen infection

Some arrests go unreported to U.S. officials, and sometimes arrested individuals do not request consular assistance, Finan wrote in an e-mail to CNN.

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"We are very aware that while the risk of infection from insulin pen re-use is extremely small, cross-contamination from an insulin pen is possible, " Finan said.

WSJ: 2nd NY hospital warns of insulin pen infection

"We don't have the exact breakdown for Mexico, and the embassy would not have that information either, " said Elizabeth A. Finan, a spokeswoman for the State Department's Bureau of Consular Affiairs.

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Olean General had not identified any specific patients who may have received an injection from another patient's pen and knew of no cases of infection, Finan said in a news release.

WSJ: 2nd NY hospital warns of insulin pen infection

"Interviews with nursing staff indicated that the practice of using one patient's insulin pen for other patients may have occurred on some patients, " said Timothy Finan, president and chief executive of Upper Allegheny Health System, the parent company of the Olean hospital.

WSJ: 2nd NY hospital warns of insulin pen infection