The World Health Organization included vaccine hesitancy on the list of threats to global health in 2019. Vaccine hesitancy is a complex matter, with reasons for not vaccinating ranging from accessibility to personal belief. While the reasons may vary, the global effect of not vaccinating has created significant issues. Vaccination currently prevents about 2-3 million deaths per year. Some countries that were close to almost eradicating diseases, such as the measles, have noticed an increase in measles cases. Globally, the number of measles cases has increased 30%. In addition to vaccine hesitancy-HIV, Dengue fever, and Ebola are among others listed as a threat to global health in 2019.