Question

A vaccine is a substance that contains all or part of a noninfectious version of a disease causing organisms. When the vaccine is administered to person, the persons immune system attacks the noninfectious version of the organism and learn to recognize its surface proteins. The next time the immune system comes in contact with the same surface proteins, it has a defense already prepared in order to respond quickly to the invading organisms. In this way a vaccine gives people immunity to the disease causing organisms

Answer 1

Vaccines can be life-saving but there have been a few cases of people catching a disease from the administered vaccine. How my genetically engineered organisms solve this problem.
A. Harmless organisms could be genetically engineered to have surface proteins from disease causing organisms.
B. Harmless organisms could be genetically engineered to recognize and destroy random cells in the body.
C. Disease causing organisms could be genetically engineered to reduce insulin instead of toxins.
D. Disease causing organisms could be genetically engineered to only be harmful to plants