The state health department is now asking all patients of one North Charleston medical clinic who received any type of injection there to be tested for hepatitis B, hepatitis C and HIV.

The S.C. Department of Health and Environmental Control announced last week it was investigating the Tri-County Spinal Care Center for a string of hepatitis B cases. Three patients who receieved spinal injections at the center in February tested positive for the disease.

The department originally notified more than 20 other patients who received similar injections during that time frame and encouraged them to be tested.

Now, it is asking all patients who received an injection of any kind at the Tri-County Spinal Care Center since September 2011 to be tested.

“DHEC’s investigation included a review of infection control procedures and injection practices,” a press release announced today. “It was determined that procedures may have been performed that resulted in a potential for exposure to an infection.”

DHEC is directing patients to contact their health care provider or DHEC’s Northwoods Health Clinic, (843) 953-0095, for more information about testing.

Editor’s Note: An earlier version of this story misidentified the name of the clinic.

Reach Lauren Sausser at 937-5598.