Vaccination

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Which type of vaccine contains weakened pathogens?

RankGuru · Accepted Answer

1. **Live Attenuated Vaccines**: These are made from pathogens (viruses or bacteria) that have been **weakened** in the laboratory so they cannot cause disease in healthy people. However, they can still replicate enough to stimulate a strong, long-lasting immune response ($e.g.,$ OPV, MMR, BCG).
2. **Inactivated (Killed) Vaccines**: These use pathogens that have been killed with chemicals, heat, or radiation ($e.g.,$ Covaxin, Salk Polio).
3. **Toxoids**: These contain inactivated toxins produced by the pathogen rather than the pathogen itself ($e.g.,$ Tetanus, Diphtheria).
4. **Subunit Vaccines**: These use only specific pieces (antigens) of the pathogen ($e.g.,$ Hepatitis B vaccine uses the surface antigen).

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