Philadelphia has had a public health lab since 1894, when the City created the Division of Pathology, Bacteriology, and Disinfection, working right in City Hall. In those early days of the new science of bacteriology, the lab focused on two main killers of the day, diphtheria and tuberculosis, and it produced antitoxin for diphtheria. Ever since then, our lab has been providing crucial information to public health staff on what invading species are circulating in the city and how we can keep them at bay.
https://www.phila.gov/2018-11-16-philadelphias-public-health-lab-heroes-protecting-the-publics-health/
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The Collected Works of Jim Garrow 