Journal Sentinel: If violence spreads like a disease, it can be interrupted. How a new team in Milwaukee is trying to stop one shooting leading to another.
https://projects.jsonline.com/news/2019/9/25/milwaukee-gun-violence-411-life-interrupts-cycle-stopping-shootings-public-health-approach.html
NY Times: Fighting Gun Violence As If It Were a Contagions
https://www.nytimes.com/2018/05/08/opinion/fighting-street-gun-violence-as-if-it-were-a-contagion.html