Since the first case detected in Beijing on Jan 19th, the number of cases imported from Wuhan increased soon. Beijing, the capital of China, which has a population of 21 million residents including 8 millions of migrants at particular risk.
Ĭurrently, the minority of the population of China has been infected, which leaves the majority of China susceptible to infection. As of Apr 12th, 2020, the global number of confirmed cases of COVID-19 has surpassed 1,600,000, including more than 100,000 deaths due to acute respiratory failure or other related complications. The novel coronavirus has been named SARS-CoV-2 by the International Committee on Taxonomy of Viruses and the disease it causes has been named “coronavirus disease 2019” (COVID-19). The World Health Organization (WHO) declared the outbreak a public health emergency of international concern on January 30th, 2020.
It spread rapidly throughout Hubei and then to other provinces and abroad. In December 2019, a new beta coronavirus (CoV) was first detected in Wuhan, Hubei Providence of China, causing clusters of unknown pneumonia patients. So far, no evidence of widespread circulation of SARS-CoV-2 in communities in Beijing was found. The transmissibility of SARS-CoV-2 was relatively high, especially among households and from HCWs, which draws specific public health attention. No significant genetic variant was identified. The basic reproduction number was 2.0, and the average serial interval was 7.6 days. The secondary attack rate of healthcare workers (HCWs) was higher than non-HCWs’ (7.3 vs 4.2%). The secondary attack rate among households was higher than social contacts (15.6 vs 4.6%). Among 585 confirmed case-patients, the median age was 39 years old. The imported cases were mainly from Wuhan initially and then from abroad.
ResultsĪ total of 602 cases were positive for SARS-CoV-2, including 585 confirmed patients and 17 asymptomatic infections.
The epidemiological and virological characteristics of SARS-CoV-2 were analyzed. To investigate the epidemiological parameters in SARS-CoV-2 infected cases in Beijing, we studied all confirmed cases and close contacts in Beijing from Jan 1st to Apr 3rd 2020. With the spread of SARS-CoV-2 worldwide, understanding the basic epidemiological parameter values of COVID-19 from real-world data in mega-cities is essential for disease prevention and control.
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