1. Microorganisms may enter the body and cause illness before the immune system can destroy them;
2. Vaccinations provide protection from microorganisms by establishing antibodies before infection;
3. A vaccination contains a usually safe form of a disease-causing microorganism;
4. Vaccination can never be completely safe, since individuals have varying degrees of side-effects from a vaccine;
5. To prevent epidemics of infectious diseases, it is necessary to vaccinate a high percentage of a population;
6. There is a conflict between a person’s right to decide about vaccination for themselves or their children, and what is of benefit to society as a whole;
7. New vaccines against influenza have to be developed regularly because the virus changes very quickly;
8. It is difficult to develop an effective vaccine against the HIV virus (which causes AIDS) because the virus damages the immune system and has a high mutation rate;
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