The specific aims of this study are as follows:

1. To determine prevalence and incidence (using a denominator such as patient-care hours) of occupational blood/body fluid exposure incidents in a random sample of HHCWs.
2. To identify the independent and joint effects of risk factors associated with exposure incidents, HBV vaccine compliance and substandard post-exposure follow-up, including:
   1. worker-centered factors (demographics, union membership, psychosocial factors, etc.);
   2. job/task, job/control variables (work flow, work pace, workload, case/mix etc.);
   3. organizational variables (availability and adequacy of resources, including the availability of safety devices and other control measures; safety climate, safety training, medical surveillance programs, etc.);
   4. patient characteristics; and
   5. work environment factors (environmental conditions in the home, safety and security of the home and neighborhood, impact of family members, etc.).
3. To identify successful risk reduction opportunities and interventions tailored to HHCWs using PAR teams.