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OBJECTIVES: To establish the etiology for outbreaks of hepatitis B virus (HBV) infections at two assisted living facilities (ALFs) and devise appropriate control measures.
DESIGN: Multisite outbreak investigations, retrospective cohort.
SETTING: Two ALFs in Illinois.
PARTICIPANTS: Facility A residents (n=120) and Facility B residents (n=105) and nursing staff (n=6).
MEASUREMENTS: For Facility...
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