SALINE, Mich. Health officials said a group of people who tested positive for the coronavirus (COVID-19) after a large house party in Saline went out and spread the virus in their communities. Health experts have traced the source of the outbreak back to a pre-Fourth of July party on July 2-July 3. The Washtenaw County Health Department has identified 43 positive cases and 66 exposed close contacts, not including family members who live with the infected patients. Contact tracers are still trying to reach people who had close contact with those who tested positive. Anyone who receives a call from a health department is asked to answer the phone.