The immunogenicity and safety of a reduced PRP-content DTPw-HBV/Hib vaccine when administered according to the accelerated EPI schedule.
BACKGROUND
Combination vaccines improve coverage, compliance and effectively introduce new antigens to mass vaccination programmes. This was a phase III, observer-blind, randomized study of GSK Biologicals diphtheria-tetanus-whole cell pertussis vaccine combined with hepatitis B and Haemophilus influenzae type b vaccines, containing a reduced amount of polyribosyl-ribitol-phosphate (PRP) and a DTPw component manufactured at a different site (DTPw-HBV/Hib2.5 [Kft]). The primary aim of this study was to demonstrate that DTPw-HBV/Hib2.5 [Kft] was not inferior to the licensed DTPw-HBV/Hib (Tritanrix(tm)-HepB/Hiberix(tm)) vaccine or the DTPw-HBV/Hib2.5 vaccine, also containing a reduced amount of PRP, with respect to the immune response to the PRP antigen, when administered to healthy infants, according to the Expanded Programme for Immunization (EPI) schedule at 6, 10 and 14 weeks of age.


METHODS
299 healthy infants were randomised to receive either DTPw-HBV/Hib2.5 [Kft] DTPw-HBV/Hib2.5 or DTPw-HBV/Hib according to the 6-10-14 week EPI schedule. Blood samples were analysed prior to the first dose of study vaccine and one month after the third vaccine dose for the analysis of immune responses. Solicited local and general symptoms such as pain, redness and swelling at the injection site and drowsiness and fever, unsolicited symptoms (defined as any additional adverse event) and serious adverse events (SAEs) were recorded up to 20 weeks of age.


RESULTS
One month after the third vaccine dose, 100% of subjects receiving DTPw-HBV/Hib2.5 [Kft] or DTPw-HBV/Hib and 98.8% of subjects receiving DTPw-HBV/Hib2.5 vaccine had seroprotective levels of anti-PRP antibodies (defined as anti-PRP antibody concentration ≥0.15 μg/ml). Seroprotective antibody concentrations were attained in over 98.9% of subjects for diphtheria, tetanus and hepatitis B. The vaccine response rate to pertussis antigen was at least 97.8% in each group. Overall, the DTPw-HBV/Hib2.5 [Kft] vaccine was well tolerated in healthy infants; no SAEs were reported in any group.


CONCLUSIONS
The DTPw-HBV/Hib2.5 [Kft] vaccine was immunogenic and well-tolerated when administered according to the EPI schedule to Indian infants.


BACKGROUND
http://www.clinicaltrials.gov NCT00473668.
Chatterjee
Sukanta
S
Department of Pediatrics, Medical College Kolkata, Kolkata, India.
Rego
Sylvan J
SJ
D'Souza
Fulton
F
Bhatia
B D
BD
Collard
Alix
A
Datta
Sanjoy K
SK
Jacquet
Jeanne-Marie
JM
D000907:Antibodies, Bacterial / Q000097:blood; D000914:Antibodies, Viral / Q000097:blood; D015721:Diphtheria-Tetanus-Pertussis Vaccine / Q000009:adverse effects* / Q000276:immunology*; D064420:Drug-Related Side Effects and Adverse Reactions; D005260:Female; D005334:Fever / Q000139:chemically induced; D018073:Haemophilus Vaccines / Q000009:adverse effects* / Q000276:immunology*; D017325:Hepatitis B Vaccines / Q000009:adverse effects* / Q000276:immunology*; D006801:Humans; D006940:Hyperemia / Q000139:chemically induced; D007115:Immunization Schedule; D007223:Infant; D008297:Male; D010146:Pain / Q000139:chemically induced; D012871:Skin Diseases / Q000139:chemically induced / Q000473:pathology; D012894:Sleep Stages; D014611:Vaccination / Q000379:methods*
D000907:Antibodies, Bacterial; D000914:Antibodies, Viral; D015721:Diphtheria-Tetanus-Pertussis Vaccine; C524361:DtwP-HepB-Hib vaccine; D018073:Haemophilus Vaccines; D017325:Hepatitis B Vaccines