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  • Title: Antibody response to pneumococcal polysaccharide vaccine in young, adult and old mice.
    Author: Aaberge IS, North RJ, Groeng EC, Løvik M.
    Journal: Scand J Immunol; 1993 Jul; 38(1):17-30. PubMed ID: 8327857.
    Abstract:
    The anti-pneumococcal antibody response was studied in young (5-week-old) and adult (10-week-old) BALB/c and CBA/J mice and in adult (9-10-week-old) and old (12-, 18- and 24-month-old) AB6F1 and B6D2F1 mice after s.c. immunization with a 23-valent pneumococcal polysaccharide vaccine. Both young and adult mice showed a significant IgM antibody response to the vaccine 6 days after immunization with 1-11 micrograms antigen. There were significant immune responses to serotypes 1, 2, 4 and 7F in contrast to small responses to serotypes 14, 19F and 23F after immunization with the vaccine. One month after immunization, there were only marginal differences in IgM anti-pneumococcal antibody levels to the vaccine (anti-PPS) between immunized and unimmunized BALB/c mice, whereas in CBA/J mice the anti-PPS remained higher in immunized than in unimmunized mice. Immunization of old mice induced a significant IgM antibody response 6 days after immunization, but the anti-PPS thereafter decreased rapidly towards preimmunization values in AB6F1 mice. A significant IgG anti-PPS was not detected in any of the mice studied. The IgA anti-PPS tended to vary over time with no consistent pattern. It is important to carefully consider age and strain of the mice used when studying the immune response to pneumococcal polysaccharide antigens.
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