A vaccine primer  pg. 2

Conjugate vaccines
Conjugate vaccines are a special type of subunit vaccine that link proteins to capsular bacterial material. The coupling of the protein to these bacterial substances renders the vaccines effective in young children. Haemophilus influenzae type B infections and pneumonia caused by Streptococcus pneumoniae are prevented by conjugate vaccines.

DNA/Recombinant vector vaccines
DNA vaccines introduce the genes that encode pathogenic proteins. After taking in the DNA—either in a “naked” form or shuttled in by a harmless virus or bacterium—cells in the body manufacture the proteins that will produce an immune response. These types of vaccines are in clinical testing for HIV, rabies and measles. At this time, none of the vaccines are being tested in children.

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