There are three basic classes of vaccine: live, killed and toxoid..
1.Toxoid vaccines: are made from inactivated toxic compounds that cause illness rather than the micro-organism. Examples of toxoid-based vaccines include tetanus and diphtheria. Toxoid vaccines are known for their efficacy.they are used for long term protection
2.Attenuated, Live Vaccines:Some vaccines contain live, attenuated microorganisms. Many of these are live viruses that have been cultivated under conditions that disable their virulent properties, or which use closely related but less dangerous organisms to produce a broad immune response; however, some are bacterial in nature.
toxoid vaccines are generally safer than attenuated live vaccines, but induce a weaker immune response, so require multiple doses.
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