Match the following terms and definitions. a. variolationb. immunityc. immunizationd. vaccinatione. virusf. capsid1. protein shell of a virus that surrounds its nucleic acid 2. resistance to disease or poison 3. vaccination; artificially stimulating antibodies to a disease 4. the act or practice of introducing a vaccine into the body as protection against disease 5. a remedial technique of purposeful infection in order to build immunity to the disease 6. a pathogenic microorganism dependent on living tissue for reproduction and growth