Abstract
Objective: To analyze the epidemiological features of coronavirus disease 2019 (COVID-19) in Jiangsu Province after starting level 1 response to major public health emergencies and assess the effectiveness of epidemic prevention and control measures took by the government. Methods: Individual information on all novel coronavirus pneumonia confirmed cases from January 10, 2020 to March 18th in Jiangsu was collected from the official website of Health Commission of Jiangsu province and its cities, Hubei Health Commission and the Chinese Health Commission. The trends in demographic and epidemiological characteristics of confirmed cases were estimated and the real time reproduction number (Rt) were calculated. Results: 631 COVID-19 cases were diagnosed in Jiangsu Province, covering 13 districts in Jiangsu. The confirmed cases consisted of imported cases (30.27%) and local transmitted cases (69.73%). 64.15% (238/371) local transmitted cases had reported a history of exposure to COVID-19 cases or patients with acute respiratory infection. Close contact with COVID-19 infectors in families, parties or some public places is the main transmission route for local transmission cases. The epidemic peak occurred from January 30 to February 4, then began to decline. The ratio of male to female cases was 1.22 to 1, and most patients were in the group of 30-70 years old, 49 patients (7.8%) with mild symptom and 572 patients (90.6%) with common type accounted for the majority. As of March 18, the cities with higher cumulative confirmed cases were Nanjing (93 cases, 15%), Suzhou (87 cases, 14%) and Xuzhou (79 cases, 12%). The Rt reached a peak of 4.05 (95%CI 2.27-6.34) on January 20, then began to decline. Rt was below the epidemic threshold (Rt<1) after January 31 and maintained a continuing downward trend. Conclusion: The epidemic preventive and control measures have contributed to interrupt local transmission of COVID-19 in Jiangsu Province, and the epidemic in Jiangsu Province was well under control in less than a month.
Highlights
Since December 2019, a cluster of cases of pneumonia of unknown cause was detected in Wuhan City, Hubei Province, China
This study aimed to describe the epidemiological characteristics of COVID-19 cases occurring in Jiangsu province until March 18, 2020, and to estimate the real time reproduction numbers to assess whether the prevention and control measures have been effective in blocking transmission
Until March 18, 2020, a total of 631 confirmed cases were reported, including 191 imported cases (30.27%), 440 local transmitted cases (69.73%). 64.15% (238/371) local transmitted cases had reported a history of exposure to COVID-19 cases or patients with acute respiratory infection (Table 1)
Summary
Since December 2019, a cluster of cases of pneumonia of unknown cause was detected in Wuhan City, Hubei Province, China. A novel coronavirus had been identified in samples obtained from cases and that initial analysis of virus genetic sequences suggested that this was the cause of the outbreak. This virus is referred to as SARS-CoV-2, and the associated disease as COVID-19 (Coronavirus Disease 2019). There are few studies on the epidemiology features and transmission dynamics of novel coronary pneumonia in Jiangsu Province. This study aimed to describe the epidemiological characteristics of COVID-19 cases occurring in Jiangsu province until March 18, 2020, and to estimate the real time reproduction numbers to assess whether the prevention and control measures have been effective in blocking transmission
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