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  • Title: Passively acquired anti-tetanus and anti-Haemophilus antibodies and the response to Haemophilus influenzae type b-tetanus toxoid conjugate vaccine in infancy.
    Author: Kurikka S, Olander RM, Eskola J, Käyhty H.
    Journal: Pediatr Infect Dis J; 1996 Jun; 15(6):530-5. PubMed ID: 8783351.
    Abstract:
    OBJECTIVE: To study the influence of maternally inherited tetanus antitoxin (anti-TT) antibodies on the response to the Haemophilus influenzae type b (Hib) capsular polysaccharide (PS)-tetanus toxoid conjugate (PRP-T) vaccine. DESIGN: One hundred thirty healthy infants received their first dose of PRP-T in the same syringe with diphtheria-tetanus-pertussis vaccine (DTP) at 1 to 2 months, and 66 of them received a second dose at 3 to 4 months of age. RESULTS: Maternal anti-TT antibodies did not interfere with the anti-Hib PS response to the first PRP-T vaccination; the geometric mean concentration (GMC) of anti-Hib PS was 0.14 microgram/ml in those with the lowest preimmunization anti-TT (< 0.3 IU/ml, n = 15) and 0.13 microgram/ml in those with the highest anti-TT (> or = 3 IU/ml, n = 25). After the second dose of PRP-T there was a positive correlation (r = 0.37, P = 0.004) between the anti-Hib PS response and the preimmunization anti-TT; those with the lowest preimmunization anti-TT (< 0.3 IU/ml, n = 9) achieved GMC of anti-Hib PS of 1.22 micrograms/ml and those with anti-TT > or = IU/ml (n = 22) anti-Hib PS GMC of 2.67 micrograms/ml. High preimmunization anti-Hib PS antibodies did not interfere with the final antibody concentrations; the GMC of anti-Hib PS after the second dose of PRP-T was 1.60 micrograms/ml in those with a preimmunization titer > or = 1.0 microgram/ml (n = 12) and 1.57 micrograms/ml in those with a titer of < 1.0 microgram/ml (n = 53). CONCLUSION: The data suggest that infants can be safely vaccinated with PRP-T even though they have received high concentrations of anti-TT from their mother.
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