References

Hepatitis B vaccine. (2014). Retrieved from AIDS info website: http://aidsinfo.nih.gov/

Microbicides. (2012). Retrieved from AIDS.gov website: http://www.aids.gov/hiv-aids-basics/prevention/prevention-research/microbicides/

Tortora, G., Funke, B., & Case, C. (2013). Microbiology an Introduction (11th ed.) Glenview, Il: Pearson Education.