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J Med Virol. 2006 Nov;78(11):1493-7.

Serum antibody decay in adults following natural respiratory syncytial virus infection.

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Department of Medicine at Rochester General Hospital, Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, New York 14621, USA.


Serum antibody decay following RSV infection in adults was examined to evaluate the durability of the immune response. Twenty subjects with RSV infection and 10 subjects who remained RSV uninfected had blood samples obtained over 16-25 months analyzed by microneutralization assay and enzyme immunoassay. The mean titers of infected subjects rose approximately eightfold post-infection. The mean rate of antibody decline was -0.20 log 2 titer per month which led to a > or =fourfold drop in titer in 75% of subjects at 1 year. In contrast, titers of uninfected subjects were relatively stable. The partial immunity resulting from a boost in serum antibody following natural RSV infection in adults appears to be short lived.

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