DENVER -- A suspended Colorado dentist reused syringes and needles in his now-shuttered practice, potentially exposing thousands of patients to HIV and hepatitis infection, health officials warned on Friday.
The Colorado Department of Public Health and Environment sent letters to 8,000 patients of dentist Stephen Stein, urging them to seek tests for the diseases after learning of "unsafe injection practices" at two Denver-area clinics he owned between September 1999 and June 2011.
Investigators found that Stein reused needles and syringes in several patients' intravenous lines at his oral surgery and dental implant clinics, in violation of standard medical protocol, the department said in a statement.
"This practice has been shown to transmit infections," the statement said. It added that there had been no confirmed cases of anyone contracting the viral infections through Stein's clinics.
The Denver Post reported that the syringes cost less than $1, according to dentists.
In the letters sent to Stein's former patients, the health department urged them to be tested for HIV, hepatitis B and hepatitis C, said Jan Stapleman, a department spokeswoman.
Stein's records were incomplete, so it is likely more people were possibly exposed than those already identified, she said.
A hot line established for Stein's patients to call was "very busy" all day on Friday, Stapleman said.
Stein's lawyer, Victoria Lovato, said her client "is cooperating with the state's investigation."
'How do I know I'm safe?'
"I don't know how clean their instruments were at the time," Lillian Carillo, who was a patient of Stein's in May 2008, said according to local NBC News station KUSA. She had a tooth extracted on that day.
"I don't know what to do. I did get an injection. He did use tools on me for the extraction. How do I know I'm safe?"
She said that she was surprised about the accusations.
"When I went to this office, I remember it being over the top. I remember the equipment [was] top of the line," Carillo said.
Jeannette Monical, who sent her two daughters to Stein to get their wisdom teeth removed, said she was "going crazy inside," KUSA reported.
"I want him to pay the price. I want him to [go to] prison," she said.
Authorities said any patient who underwent any type of injection at the clinics, including sedation, might be at risk. They cautioned that if any patients of Stein tested positive for any of the viruses, there was no way to determine how they contracted the disease.
Stein's license to practice dentistry in Colorado was suspended for an unrelated matter, said Cory Everett-Lozano, spokeswoman for the state Department of Regulatory Agencies, which oversees medical licenses.
Until that probe is resolved, the reasons for Stein's current suspension are confidential, she said.
Lynn Kimbrough, a spokeswoman for the U.S. Attorney's Office in Denver, said Stein was already the target of a criminal probe for possible prescription fraud before the allegations emerged about reusing syringes. She said no criminal charges had so far been filed.
NBC News station KUSA, msnbc.staff and Reuters contributed to this report.
More content from msnbc.com and NBC News:
- Expert: Penn State report ups legal risk for former president
- 5-mile-long landslide in Alaska national park; warming eyed as culprit
- Same-sex couple fights to stop deportation
- Family fulfills dying man's wish: $500 tip for waitress
- Missing New York woman found alive after 'girl with this phone is dead' text
- Man becomes cop to honor murdered brother
- Video: Twitter account used to bully students shut down