名潮二代傳播滲社區 攻入診所醫院 非同層餐廳顧客卡地亞店員確診 衛署料群組續擴（2021年3月1日）。明報，取自https://news.mingpao.com/pns/%E6%B8%AF%E8%81%9E/article/20210301/s00002/1614536600703
Community spread means spread of an illness for which the source of infection is unknown. It’s also possible, however, that the patient may have been exposed to a returned traveler who was infected.
CDC Confirms Possible Instance of Community Spread of COVID-19 in U.S. (2020, February 26). US Centers for Disease Control and Prevention. Retrieved from https://www.cdc.gov/media/releases/2020/s0226-Covid-19-spread.html