FOX NEWS - Anti-vaxxers, or those who oppose vaccines, were deemed a top "threat to global health" in 2019 by the World Health Organization (WHO).
"Vaccine hesitancy," as the United Nations agency calls it, "threatens to reverse progress made in tackling vaccine-preventable diseases."
The organization in a recently released list said that while vaccines are "one of the most cost-effective ways for avoiding disease," there are several reasons -- including "complacency, convenience and confidence" -- that are to blame.
Vaccination has caused certain diseases, like polio and diphtheria, to become rare in the U.S. Indeed, vaccines help the body develop an immunity to diseases by imitating infections so the body is able to more effectively combat those infections in the future.