Abstract:
:Longitudinal serum samples were collected from 542 children that had participated in a Swedish pertussis vaccine trial 1992-1995 [Gustafsson L, Hallander HO, Olin P, Reizenstein E, Storsaeter J. A controlled trial of a two-component acellular, a five-component acellular, and a whole-cell pertussis vaccine. N Engl J Med 1996;334(6):349-355] and who did not contract pertussis. The sera were analyzed for post vaccination antibody decay and for booster response of anti-PT (IgG antibodies against pertussis toxin), as measured by ELISA. Generally, an initial rapid decay of antitoxin antibody concentration was followed by a slower decay; the change occurring when the geometric mean level of antitoxin concentration reached 8-9 ELISA Units/mL (EU/mL). The time needed to reach this level was 8-9 months after the third dose in a 2, 4, and 6 months schedule. A "best-fit" combined regression model was used to predict when 50% of the children have less than the minimum level of detection of anti-PT (1EU/mL). This occurred about 65 months after dose 3 at an age of 6 years. The anti-PT response to a booster dose was evident but the post-booster geometric mean values decreased with number of years after the third dose and the response appeared later. The results indicate that a pre-school booster might be considered at 6 years of age or earlier.
journal_name
Vaccinejournal_title
Vaccineauthors
Hallander HO,Gustafsson L,Ljungman M,Storsaeter Jdoi
10.1016/j.vaccine.2005.06.009subject
Has Abstractpub_date
2005-11-16 00:00:00pages
5359-64issue
46-47eissn
0264-410Xissn
1873-2518pii
S0264-410X(05)00602-Xjournal_volume
23pub_type
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