The FDA posted a warning today against sharing the disposable insulin shots after the William Beaumont Army Medical Center in El Paso, Texas, last month said 2,114 diabetic patients may be at risk “as a result of incorrect procedures.” The sharing occurred from 2007-2009, the FDA said in a statement issued today.

The Army identified a second hospital that may have been sharing the shots as Fort Polk’s Bayne-Jones Army Community Hospital in Louisiana. “Less than 10” patients may have been exposed there, Davis said. Two types of insulin pens were used, he said, declining to identify the brands.

The shots carry multiple doses of insulin intended for a single patient. The hospitals reportedly replaced the needle for each shot as indicated, though they may have improperly used the same pens for multiple patients, according to the FDA. Even with a fresh needle, the pen reservoir or cartridge can still be contaminated with blood, the FDA said.