In February, family members gathered for a Chicago-area funeral. A family friend who had been out of state attended and was just a bit sick with mild respiratory symptoms.Before long, 16 people between the ages of 5 and 86 had been infected with the novel coronavirus (seven confirmed and nine probable), and three had died.The case study, published Wednesday by the Centers for Disease Control and Prevention, is one of the most detailed looks at how covid-19 moves through communities and shows how a single person can set off a chain reaction of infections. The transmissions — traced to a funeral and birthday party held three days apart — took place before major social distancing policies were implemented and may have facilitated transmission of covid-19 to the broader Chicago community. (The CDC also previously investigated how those aboard the Diamond Princess cruise ship that had docked in Japan became infected.)The CDC report begins the night before the funeral. The traveling friend — dubbed “Patient A1.1” as the first patient in the first transmission “generation” in the first cluster discovered — shared a takeout meal eaten from common serving dishes with two family members of the deceased at their home. The

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