Risk of hepatitis C virus transmission to surgeons and nurses from infected patients: model-based estimates in France

Background/Aim: The aim of this study was to estimate the annual number of cases of hepatitis C virus transmission from infected patients to uninfecte d surgeons or nurses due to percutaneous injury during invasive procedures. Methods: The risk of transmission was estimated using a model involving thr ee probabilities: A, that a health care worker sustains at least one percut aneous injury during a procedure; B, that 1 to 10% of patients are seroposi tive for hepatitis C virus; and C, that infection by this virus is transmit ted to the Health Care Worker after such exposure. Probability A was estima ted from the results of 2 French multicentric prospective trials. Probabili ty C was estimated from the results of 9 international prospective studies. A ten-fold decreased risk was assumed for surgeons who wear gloves and use solid-bore suture needles. Results: During a single procedure, the estimated probability of hepatitis C virus transmission from an infected patient to an uninfected surgeon rang ed from 4.2 x 10(-5)% to 4.2 x 10(-4)%, and from 2.98 x 10(-6)% to 2.98 x 1 0-5% to an uninfected nurse. For surgeons, the estimated annual cumulative risk of occupational infection ranged from 0.01% to 0.1% (1 in 10000 to 1 i n 1000), and for nurses from 0.0054% to 0.054% (1 in 18700 to 1 in 1900), Conclusions: Between 2 and 21 surgeons out of a total 20 000 are estimated to acquire occupationally-related hepatitis C virus infection, and between 16 and 167 nurses out of a total 300 000, These estimates strongly justify introducing preventive measures to protect health care workers from bloodbo rne infection.