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  • Vaccine

    A preparation that stimulates an immune response that can prevent an infection or create resistance to an infection.1

  • Vector

    An organism (e.g., Anopheles mosquito) that transmits an infectious agent (e.g. malaria parasite) from one host to the other (e.g., from mosquito to human).1

  • Virus

    A microorganism composed of a piece of genetic material - RNA or DNA - surrounded by a protein coat. To replicate, a virus must infect a cell and direct its cellular machinery to produce new viruses.1