table 1. Seroprevalence for HIV, HBV, and HCV at Facilities A and B from January 1, 2010, Through May 28, 2014, for the General Facility and Exposed Cohort Patients With Postexposure Testing


–– Facility Ab


Facility A exposed cohort


Facility Bb


Facility B exposed cohort


Total positive HBsAg tests (obs)


143 0


105 2


Total patients tested for HBsAg (denom)


16,258 516


9,054 610


Expected


% HBsAg positive (obs/ denom)


0.9 0


1.2 0.3


HBsAg positive based on facility prevalencea


–


4.5 –


7.1


Total positive HCV Ab tests (obs)


1,818 41


673 59


Total patients tested for HCV Ab (denom)


36,292 508


12,731 636


% HCV Ab positive (obs/ denom)


5.0 8.1


5.3 9.3


Expected HCV positive based on facility prevalencea


–


25.4 –


33.6 Total


positive HIV Ab tests (obs)


99 2


92 8


Total Patients tested for HIV Ab (denom)


30,024 498


18,300 639


% HIV Ab positive (obs/


denom)


0.3 0.4


0.5 1.3


antibody; HIV, human immunodeficiency virus; HIV Ab, HIV antibody; obs, observed. aExpected counts were calculated as (observed facility/denominator facility) × exposed cohort denominator. bCohort patients are included within the total facility unique patients tested since some cohort patients may also have been tested as part of routine patient care.


Expected HIV positive based on facility prevalencea


–


1.6 –


3.2 NOTE. An ellipsis means expected count not applicable to facility. denom, denominator; HbsAg, hepatitis B surface antigen; HBV, hepatitis B virus; HCV, hepatitis C virus; HCV Ab, HCV


1122 infection control & hospital epidemiology october 2015, vol. 36, no. 10

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