Issues in selection of DTwP-based combination vaccines.

Area of Science:

• Vaccinology and Public Health
• Global Health Policy
• Pharmaceutical Supply Chain Management

Background:

• Diphtheria-tetanus-pertussis (whole cell) vaccines (DTwP) combination vaccines are primarily produced in Europe for export.
• Past procurement tenders significantly exceeded demand for DTwP vaccines, but current supply and demand are converging.
• Developing countries are emerging as manufacturers of combination vaccines.

Purpose of the Study:

• To examine regulatory, supply, acceptance, and financing issues associated with DTwP-based combination vaccines.
• To identify key factors influencing the selection and adoption of these vaccines.
• To develop a predictive model for future combination vaccine uptake.

Main Methods:

• Analysis of regulatory oversight, supply dynamics, and financing mechanisms.
• Evaluation of disease burden, vaccine presentation, and long-term financing availability.
• Development and validation of a predictive model for regional country groupings.

Main Results:

• Regulatory oversight is a critical factor for future availability.
• Antigen allocation issues may impact supply of DTwP-based combinations.
• Vaccine price is secondary to programmatic advantages and complex selection factors.

Conclusions:

• DTwP-based combination vaccines offer programmatic advantages but require careful consideration of selection factors.
• A validated model can predict the uptake of DTwP-based combination vaccines.
• The model may be applicable for projecting the uptake of other combination vaccines.