White Blood Cells Sources:https://www.urmc.rochester.edu/encyclopedia/content.aspx?ContentID=35&ContentTypeID=160https://medlineplus.gov/ency/presentations/100151_3.htmhttps://theconversation.com/four-big-insights-into-hiv-aids-that-provide-hope-of-finding-a-vaccine-86736 Infographic by Amreen Hashem
