Journal
VACCINE
Volume 23, Issue 6, Pages 762-768Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.vaccine.2004.07.024
Keywords
23-valent pneumococcal vaccine; elderly immunity; Streptococcus pneumoniae
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To evaluate the immunogenicity of 23-valent pneumococcal polysaccharide vaccine in 52 nursing homes residents aged greater than or equal to60 years, IgG antibodies to serotypes 1, 5, 6B, and 8 were measured by ELISA and compared before, and 1 and 12 months following vaccination. A significant immunological response for all serotypes was observed at 1 month after vaccination. The mean increase in antibody concentration was highly variable and ranged from 1.6 to 2.7. After 1 year, the mean concentrations remained significantly higher than prior to vaccination for serotypes 1, 6B, and 8, although there was a decrease in all mean IgG concentrations. Antibody levels were higher in men than in women, before and after immunisation. Post-vaccination values tended to be lower among subjects aged >75 years. Reduction in IgG concentrations by 33% 1 year after vaccination suggests that revaccination of institutionalised elderly people may be needed. (C) 2004 Elsevier Ltd. All rights reserved.
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