Comparison of Live and Killed Vaccines

Comparison of Live and Killed Vaccines:

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Advantages of live attenuated vaccines:

1. Immunity lasts for numerous years.
2. Booster doses are not essential

Disadvantages:

The live organisms might relapse to virulent forms.

Toxoids:

Toxins whenever treated with formalin are transformed into toxoid that retains the antigenicity however loses its toxicity. Tetanus toxoid and Diphtheria toxoid are employed regularly for immunization.

 

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