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"Outbreak of Gonorrhea among Pupils of a Public Elementary School"
This chart shows how gonorrhea was spread among children who attended the same school. It highlights "perversion contact," school contact, and family contact.
"Investigation of a Localized Outbreak of Syphilis in New York City"
This graphic shows how syphilis was spread among people in NYC. It shows "normal," homosexual, and "family and other" contacts.