According to the U.S. Food and Drug Administration, many people are ill and one person has died after receiving unsterilized intravenous fluids.

At least 40 patients mistakenly received the simulated intravenous fluids, meant for training purposes only, rather than the saline solution typically given to patients in the hospital. The simulated solution was mistakenly shipped to urgent care facilities, surgery centers, and medical centers in seven states.

Patients given the practice solution suffered adverse effects including fever, headache, chills and tremors. The symptoms often developed immediately, allowing the patients to receive quick medical attention from whomever was administering the solution, according to the FDA.

The FDA advises that health care professionals carefully check all fluid bags to be certain they are not training products. Patients are also encouraged to check their IV bags and make certain they are marked sterile.

The practice products were distributed by Wallcur LLC, a San Diego company that manufactures the saline along with other training products. The practice solution was put into circulation beginning in May of 2014, according to USA Today.

Wallcur recalled the products beginning on Jan. 7 after they realized the errors that were being made by medical facilities. In a statement, the company said “Despite the fact that the products are intended for ‘clinical simulation’ only, we are aware of reports that these products have been used outside of their intended use and administered to patients.”

The FDA is working with distributors to determine how exactly the practice products entered into the medical supply chain.

Medical-grade supplies of .9 percent sodium chloride, also known as normal saline, is used for a variety of reasons. One example would be to hydrate patients in preparation for hemodialysis.

The agency also notes that there has been a shortage of normal saline for the past year. To help alleviate the shortage, companies have been temporarily allowed to import the solution from Europe.

States affected by the recall are: Florida, Georgia, Idaho, Louisiana, North Carolina, New York, and Colorado.