Hepatitis B outbreak traced to an oral surgeon

Area of Science:

• Hepatology
• Infectious Diseases
• Dentistry

Background:

• Hepatitis B virus (HBV) infection poses a significant public health concern.
• Dental procedures are a potential setting for iatrogenic transmission of bloodborne pathogens.
• Identifying sources of HBV transmission is crucial for prevention and control.

Purpose of the Study:

• To investigate a suspected outbreak of hepatitis B linked to a dental practice.
• To determine the mode of transmission and identify the source of infection.

Main Methods:

• Case-control study investigating patients with hepatitis B.
• Epidemiological tracing to identify common exposures.
• Serological testing for hepatitis B surface antigen (HBsAg) and subtype analysis.
• Investigation of dental office sterilization and procedures.

Main Results:

• Fifty-five of 71 hepatitis B cases were linked to a single oral surgeon.
• The dentist was an asymptomatic carrier of HBsAg, subtype ay, matching 9/11 infected patients.
• No gross inadequacies in sterilization were found; transmission likely occurred via "hemoral" route from dentist's cuts.

Conclusions:

• An asymptomatic dentist, carrying HBsAg, was the likely source of hepatitis B infection for 55 patients.
• Transmission may have occurred through direct contact with infected blood from the dentist's cuts during procedures.
• This highlights the risk of HBV transmission in dental settings, even with seemingly adequate sterilization.