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Table 18.1 Comparison of different vaccine technologies:

Despite the fact that viral vectors and DNA vaccines have parallel attributes as given in Table 1, they are only in their initial stages of clinical progress.Currently researchers worldwide are working on designing the vaccines in which the induction of CD8+ cytolytic T lymphocytes (CTL) responses and antibodies is emphasized due to the prominent role of CTL in such vaccines. Similarly designing of vaccines that can induce specific types of T helper responses, Th1 or Th2 are encouraged for the same reasons.