Page 269 - AIDSBK23C

Page 269

also exist! If testing of a specific source specimen or patient of HIV exposure is undertaken, it
should be carried out in conformity with local statutes.
Hepatitis continues to be the greatest risk to workers exposed to blood or body fluids,
th
though the incidence of infection declined markedly in the last decade of the 20 century. In
1985 there were over 300 000 cases of hepatitis B reported in the United States, with 12,000
health care workers infected, but this declined to 400 cases of hepatitis B in health care workers
in 1995.[161]
Vaccination for hepatitis B virus (HBV) is recommended for workers in areas with
potential exposure. This would include persons employed in health care with potential exposure
to blood or blood products in the performance of routine duties. Post-exposure prophylaxis for
HBV consists of testing for antibody to HBsAg in persons whose immune status is not known.
Persons previously vaccinated against HBV should also be tested if their immune status has not
been assessed in the preceding 2 years. If no immunity to HBV is found, then exposed workers
should receive HBV vaccine as well as hepatitis B hyperimmune serum globulin
(HBIG).[160,161,1070]
Laboratory testing after HIV exposure includes HIV test at the time of exposure, with
follow-up testing at 6, 12, and 24 weeks. Measurement of HIV viral load is not recommended
unless there is evidence for acute retroviral syndrome. Testing for hepatitis B and C can also be
done at the time of exposure.[131]
Non-occupational exposures to HIV include inadvertent sexual transmissions and sexual
assaults. Prophylaxis for such exposures is hard to define. Experiments in primates suggest that
antiretroviral drug therapy must be instituted within 72 hours of sexual exposure, and optimally
within 36 hours, and continued for at least 28 days.[131,1083] Postexposure prophylaxis is
recommended, but complicated by early recognition and adherence to medications once
prescribed. It is not cost effective for low risk exposure situations. Such prophylaxis is not
completely protective. The antiretroviral drugs regimens have not been completely
defined.[1084]