Combination vaccines are necessary and important for the continuing success
of our immunization program, especially when more vaccines are added to th
e already crowded immunization schedule. However, the multiplicity of compe
ting vaccine products, with various overlapping antigen menu and subtle imm
unologic differences, may be confusing to the busy practitioner. The cost-e
ffectiveness of the use of combination vaccines will depend on a number of
factors, including fair and competitive pricing, appropriate reimbursement
for vaccine administration fees, and critical economic algorithms for vacci
ne selection and purchase.