Pest Control = is the regulation and/or management of a species defined as a pest, usually because it is perceived to be detrimental to a person’s health, the ecology or the economy.
Public Health = science and practice of protecting and improving the health of a community, as by preventive medicine, health education, control of communicable diseases, application of sanitary measures, and monitoring of environmental hazards.
We have often talked about the things that have killed more humans than anything else – #1 mosquito = malaria, dengue fever and fleas = bubonic plague.