Human immunodeficiency virus transmission in health care settings. Risks to health care workers.

Taken together, studies of seroconversion, exposure incidents, and compliance with Universal Precautions Policy help researchers understand the risks to health care workers of occupationally acquired HIV infection. The seroconversion studies show that the risk of infection is low (1 in 250) even when the incident is a percutaneous exposure to blood from a known HIV-positive patient. When the exposure is to blood from a patient whose HIV-status is unknown, or if the exposure is not through the skin, or if the exposure is to a body substance other than blood, the risk is considerably lower. The studies of exposure incidents show that for most health care workers, percutaneous exposures to blood are infrequent. Studies of compliance with Universal Precautions Policy show that exposure incidents that do occur can be prevented nearly half the time. The risk of patient-to-provider transmission of HIV is small but not completely negligible. This small risk can be made even smaller by adhering to recommended infection control guidelines, but it cannot be eliminated completely. Although most health care workers enter the medical field accepting that their work may expose them to infectious agents, there is still a desire for risk-free practice. Achieving an entirely risk-free practice is probably impossible; it is certainly not within reach today. For the foreseeable future, the only reasonable course is to fully understand the risks, to enter into practice psychologically prepared to accept these risks, and to practice in a way that minimizes exposures without compromising patient care.