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Evaluation of hepatitis B vaccine immunogenicity among older adults during an outbreak response in assisted living facilities☆
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Published Date:
Oct 18 2011
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Publisher's site:
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Source:Vaccine. 29(50):9316-9320.
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Details:
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Alternative Title:Vaccine
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Personal Author:
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Description:Background During the past decade, in the United States, an increasing number of hepatitis B outbreaks have been reported in assisted living facilities (ALFs) as a result of breaches in infection control practices. We evaluated the seroprotection rates conferred by hepatitis B vaccine among older adults during a response to an outbreak that occurred in multiple ALFs and assessed the influence of demographic and clinical factors on vaccine response. Methods Residents were screened for hepatitis B and C infection prior to vaccination and susceptible residents were vaccinated against hepatitis B with one dose of 20 μg Engerix-B™ (GSK) given at 0, 1, and 4 months. Blood samples were collected 80–90 days after the third vaccine dose to test for anti-HBs levels. Results Of the 48 residents who had post-vaccination blood specimens collected after the third vaccine dose, 16 (33.3%) achieved anti-HBs concentration ≥10 mIU/mL. Age was a significant determinant of seroprotection with rates decreasing from 88% among persons aged ≤60 years to 12% among persons aged ≤90 years (p = 0.001). Geometric mean concentrations were higher among non-diabetic than diabetic residents, however, the difference was not statistically significant (5.1 vs. 3.8 mIU/mL, p = 0.7). Conclusions These findings highlight that hepatitis B vaccination is of limited effectiveness when administered to older adults. Improvements in infection control and vaccination at earlier ages might be necessary to prevent spread of infection in ALFs.
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Subject:
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Pubmed ID:22015390
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Pubmed Central ID:PMC4610903
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