Match the following terms and definitions. 1. protein shell of a virus that surrounds its nucleic acid immunity 2. resistance to disease or poison variolation 3. vaccination; artificially stimulating antibodies to a disease immunization 4. the act or practice of introducing a vaccine into the body as protection against disease virus 5. a remedial technique of purposeful infection in order to build immunity to the disease vaccination 6. a pathogenic microorganism dependent on living tissue for reproduction and growth capsid