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Pertussis immunization of infants using a new combined DTP-polio vaccine
Insights
A new combined Diphtheria-Tetanus-Pertussis-Poliomyelitis (DTP-Polio) vaccine shows a satisfactory pertussis agglutinin response in infants after two doses. This suggests the DTP-Polio vaccine is suitable for a two-dose primary immunization schedule.
Area of Science:
- Immunology
- Vaccinology
- Pediatric Infectious Diseases
Background:
- The Diphtheria-Tetanus-Pertussis-Poliomyelitis (DTP-Polio) vaccine is a combined inactivated vaccine.
- Evaluating vaccine efficacy is crucial for public health, especially in infant immunization schedules.
Purpose of the Study:
- To assess the pertussis agglutinin response in infants following a new DTP-Polio inactivated vaccine.
- To determine the suitability of the DTP-Polio vaccine for a two-dose primary immunization schedule.
Main Methods:
- Study involved 62 infants aged two to three months.
- Infants received three doses of DTP-Polio vaccine at two-month intervals.
- Pertussis agglutinin levels were measured after vaccination doses.
Main Results:
- A satisfactory pertussis agglutinin response was observed after two DTP-Polio vaccine doses.
- While three doses showed higher titres, the seroconversion rate difference between two (88.8%) and three (96.3%) doses was not significant.
- The vaccine contains at least four International Protective Units of pertussis antigen per dose.
Conclusions:
- The DTP-Polio inactivated vaccine elicits a robust pertussis immune response.
- A two-dose primary immunization schedule with this DTP-Polio vaccine appears effective against pertussis.
- This finding supports the potential use of the DTP-Polio vaccine in simplified infant vaccination protocols.
Abstract:
As part of the evaluation of a new combined Diphtheria-Tetanus-Pertussis-Poliomyelitis (DTP-Polio) inactivated vaccine, the pertussis agglutinin response was studied in 62 infants, two to three months old. Each dose of vaccine combined these antigens in a 0.5 ml volume, and contained at least four International Protective Units of pertussis antigen adsorbed on aluminium hydroxide. Infants were vaccinated with three doses of DTP-Polio vaccine at two month intervals. Pertussis agglutinin determinations showed a satisfactory response after two DTP-Polio vaccine doses. Although higher agglutinin titres were apparent after three doses than after two, no significant difference was observed in the seroconversion rate after two or three doses (88.8% and 96.3% respectively). The DTP-Polio vaccine would thus seem suitable for use in a two-dose primary immunization schedule against pertussis.