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| Epidemiological characteristics of family clusters of COVID-19in Henan Province |
| YE Ying*, FAN Wei, WANG Wenhua, SHEN Xiaojing, ZHANG Xiaoxiao, PAN Jingjing, WANG Haifeng, HUANG Xueyong
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| *Henan Provincial Center for Disease Control and Prevention, Zhengzhou, Henan 450016, China |
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Abstract Objective To learn the epidemiological characteristics of family clusters of COVID-19 in Henan Province from January 23 to February 22, 2020, so as to provide reference for the prevention and control. Methods The data of family clusters of COVID-19 in Henan Province from January 23 to February 22 was retrieved from Public Health Emergency Management System, the epidemiological characteristics of time, space, population distribution and clinical feasures were analyzed. Results By February 22, there were 202 family clusters of COVID-19, with 546 cases reported in Henan Province, including 493 ( 90.29% ) confirmed cases and 53 ( 9.71% ) asymptomatic cases. There were 247 ( 45.24% ) imported cases and 299 ( 54.76% ) local cases. Most of the clusters were reported from January 25 to February 7, with 129 clusters accounting for 63.86% . The cases reported before February 5 were mainly imported ( 153 cases, 57.09% ) , after that local cases were predominant ( 168 cases, 68.29% ) . Eighteen cities in Henan Province all reported family clusters of COVID-19, with Xinyang, Zhengzhou, Nanyang, Zhumadian and Shangqiu as the top five. Most of the confirmed cases ( 430, 87.22% ) were mild. The median and longest incubation period was 8 and 17 days, respectively. The intergenerational distribution was dominated by first-generation and second-generation cases ( 537 cases, 98.35% ) . A total of 5 635 close contacts were tracked down, of whom 262 were secondary cases, with an incidence rate of 4.65%. The first cases of the family clusters were mainly imported from other provinces ( 149 cases, 73.76% ) . Conclusions The family clusters of COVID-19 in Henan Province were concentrated from January 25 to February 7. The source of infection mainly comes from other provinces. Most of the cases are first-and second-generation cases, with longer incubation period. Close contacts have higher incidence rate.
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Received: 13 April 2020
Revised: 03 June 2020
Published: 14 August 2020
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