• vaccination


    Vaccination is…


  • vaccine


    A vaccine is…

    A substance or mixture of different substances used to prompt the immune system to mount a response against a given pathogen. Attenuated vaccines contain live pathogen that has been disabled in their virulent properties. Inactivated or killed vaccines are made of pathogens that have been killed off, of certain parts of pathogens, or of toxins. In many cases, an adjuvant is added to a vaccine.

  • virulence


    Virulence means…

    The extent of pathogenicity of a pathogenic strain.

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