Paper: The novel coronavirus Pneumonia Emergency Response Epidemiology Team, 2020

Reference:
The Novel Coronavirus Pneumonia Response Epidemiology Team. (2020). The epidemiological characteristics of an outbreak of 2019 novel coronavirus diseases (COVID-19)—China, 2020. China CDC Weekly, 2(8), 113-122.

All Covid 19 cases reported through February 11, 2020 were extracted from China’s Infectious Disease Information System.

Analyses included the following: 1) summary of patient characteristics; 2) examination of age distributions and sex rations; 3) calculation of case fatality and mortality rates; 4) geo-temporal analysis of viral spread; 5) epidemiological curve construction; and 6)subgroup analysis

A total of 72 314 patient records-44 672 (61.8%) confirmed cases, 16 186 (22.4%) suspected cases, 10567 (14.6%) clinical diagnosed cases (Hubei only), and 889 asymptomatic cases (1.2%)-contributed data for the analysis. Among confirmed cases, most were aged 30-79 years (86.6%), diagnosed in Hubei (74.7%), and considered mild/mild pneumonia (80.9%).

The COVID-19 epidemic has spread very quickly. It only took 30 days to expand from Hubei to the rest of Mainland China. With many people returning from a long holiday, China needs to prepare for the possible rebound of the epidemic

A total of 1 023 deaths occurred among confirmed cases for an overall case-fatality rate of 2.3%.

The COVID-19 spread outward from Hubei sometime after December 2019 and by February 11, 2020, 1 386 counties across all 31 provinces were affected.

The epidemic curve of onset of symptoms peaked in January 23-26, then began to decline leading up to February 11