OBJECTIVE: To evaluate the effectiveness in low birth weight (LBW) infants of the currently recommended immunization schedule for conjugated Haemophilus influenzae type b (HIB) vaccine. METHODS: We quantified antibody responses in 36 preterm infants with a mean birth weight of 1060 g and a mean gestational age of 28 weeks. Infants were immunized with 0.5 mL of HIB vaccine at 2 and 4 months' postnatal age. Specific HIB antibodies were quantified on cord blood, immediately before each immunization and 2 months after the last immunization. RESULTS: Even though the geometric mean titers increased significantly during the study period, they were still markedly lower than values reported in term infants. After the second immunization, only 24 infants (67%) attained antibody concentrations of more than 0.25 micrograms/mL, defined as seropositivity. Also, only 53% of infants achieved antibody concentrations of more than 1.0 micrograms/mL compared with 92% as reported in term infants. Stepwise logistic regression identified gestational age of 27 weeks or less and the amount of intravenous immunoglobulin received as the significant variables influencing the antibody response after the first immunization. The incidence of side effects was negligible. CONCLUSIONS: We conclude that LBW infants, and especially those born at 27 or less weeks' gestation, do not respond as effectively to the HIB vaccine. We speculate that reevaluation of the current immunization schedule may be required for very LBW infants.
OBJECTIVE: To evaluate the effectiveness in low birth weight (LBW) infants of the currently recommended immunization schedule for conjugated Haemophilus influenzae type b (HIB) vaccine. METHODS: We quantified antibody responses in 36 preterm infants with a mean birth weight of 1060 g and a mean gestational age of 28 weeks. Infants were immunized with 0.5 mL of HIB vaccine at 2 and 4 months' postnatal age. Specific HIB antibodies were quantified on cord blood, immediately before each immunization and 2 months after the last immunization. RESULTS: Even though the geometric mean titers increased significantly during the study period, they were still markedly lower than values reported in term infants. After the second immunization, only 24 infants (67%) attained antibody concentrations of more than 0.25 micrograms/mL, defined as seropositivity. Also, only 53% of infants achieved antibody concentrations of more than 1.0 micrograms/mL compared with 92% as reported in term infants. Stepwise logistic regression identified gestational age of 27 weeks or less and the amount of intravenous immunoglobulin received as the significant variables influencing the antibody response after the first immunization. The incidence of side effects was negligible. CONCLUSIONS: We conclude that LBW infants, and especially those born at 27 or less weeks' gestation, do not respond as effectively to the HIB vaccine. We speculate that reevaluation of the current immunization schedule may be required for very LBW infants.
Authors: Carl T D'Angio; Theresa E Murray; Lei Li; Roy J Heyne; T Michael O'Shea; Robert L Schelonka; Seetha Shankaran; Shahnaz Duara; Ronald N Goldberg; Barbara J Stoll; David K Stevenson; Betty R Vohr; Dale L Phelps; Waldemar A Carlo; Michael E Pichichero; Abhik Das; Rosemary D Higgins Journal: Pediatr Infect Dis J Date: 2013-12 Impact factor: 2.129
Authors: Carl T D'Angio; Claire P Wyman; Ravi S Misra; Jessica L Halliley; Hongyue Wang; Julianne E Hunn; Caitlin M Fallone; F Eun-Hyung Lee Journal: Vaccine Date: 2017-08-12 Impact factor: 3.641
Authors: P T Heath; R Booy; J McVernon; J Bowen-Morris; H Griffiths; M P E Slack; A C Moloney; M E Ramsay; E R Moxon Journal: Arch Dis Child Date: 2003-03 Impact factor: 3.791
Authors: Carl T D'Angio; Roy J Heyne; T Michael O'Shea; Robert L Schelonka; Seetha Shankaran; Shahnaz Duara; Ronald N Goldberg; Barbara J Stoll; Krisa P Van Meurs; Betty R Vohr; Abhik Das; Lei Li; Robert L Burton; Betty Hastings; Dale L Phelps; Pablo J Sanchez; Waldemar A Carlo; David K Stevenson; Rosemary D Higgins Journal: Pediatr Infect Dis J Date: 2010-07 Impact factor: 2.129