Vaccine with highest efficacy-
Correct Answer: DPT
Description: Three doses of DPT each of which is usually 0.5 ml should be considered optimal for primary immunization. It is associated with higher and more sustained levels of diphtheria and tetanus antitoxin and acceptable level of peussis protection i.e vaccine efficiency 70 percent. (refer pgno 162 park 23 rd edition)
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