What are vaccines and how are they beneficial?

The purpose of the research paper is to discover the process in which vaccines are developed by looking closely at the extensive research and experiments that are conducted in order to develop and approve a vaccination for human use. I also want to be able to explain how vaccines are able to provide immunity to diseases and additionally how herd immunity is obtained and works to protect humans from disease.
I have decided on a few questions I want to be able to answer through my research. What are vaccines and how are they beneficial? What side effects and dangers do vaccinations pose to humans? Why is it important to vaccinate against diseases? What is herd immunity? Why are previously eradicated diseases becoming prevalent again?

The paper must cite at least 8 different references (no more than 7 years old), at least 5 of which need to be peer-reviewed articles from scholarly journals.
The final version must include acceptable spelling and grammar and be written in APA format in Times New Roman 12 point font, and 1″ margins, and double-spaced.
Citing Sources
You should cite your source when:
You are making an important statement or using a unique idea from something you read. The citation should include the author(s) and year of publication.
You are using a direct quotation, in which case you also cite the page number(s).
You are citing specific statistics, dates, or numbers (also cite page numbers).

the minimum of 8 pages is without the cover page and references.

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