Objective To conduct epidemiological investigation of a family cluster of coronavirus disease 2019 （COVID-19） in Fangshan District， Beijing， so as to provide reference and scientific basis for the strategy of prevention and control.
Methods Based on the "Prevention and Control Plan for COVID-19 （Third Edition）"issued by the National Health Commission of China， two cases from the same family were studied by field epidemiological investigation method. Sputum and/or throat swab specimens were collected and sent to the laboratory of Fangshan District Center for Disease Control and Prevention （CDC） for nucleic acid detection of 2019 novel coronavirus （2019-nCoV）. Tracking close contacts and isolation observation were conducted.
Results Both sputum and throat swab specimens of case 1 were positive for 2019-nCoV nucleic acid on February 3rd， 2020. Case 2 （wife of case 1） received screening as a close contact， and throat swab specimen was positive on February 4th， 2020. Therefore， it was determined to be a family cluster. The epidemic was effectively controlled after a series of measures， including isolation treatment， medical observation according to management of close contact and terminal disinfection of residence.
Conclusion The CDC professionals should strengthen monitoring of new findings， comprehensively analyze case data based on the latest research trends， improve professional sensitivity， and conduct timely screening to detect cases as soon as possible for the prevention of further epidemic spreading.
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