{"doi":"10.3760/cma.j.issn.0254-6450.2020.02.003","title":"[The epidemiological characteristics of an outbreak of 2019 novel coronavirus diseases (COVID-19) in China].","abstract":"<b>Objective:</b> An outbreak of 2019 novel coronavirus diseases (COVID-19) in Wuhan, China has spread quickly nationwide. Here, we report results of a descriptive, exploratory analysis of all cases diagnosed as of February 11, 2020. <b>Methods:</b> All COVID-19 cases reported through February 11, 2020 were extracted from China's Infectious Disease Information System. Analyses included: 1) summary of patient characteristics; 2) examination of age distributions and sex ratios; 3) calculation of case fatality and mortality rates; 4) geo-temporal analysis of viral spread; 5) epidemiological curve construction; and 6) subgroup analysis. <b>Results:</b> A total of 72 314 patient records-44 672 (61.8<i>%</i>) confirmed cases, 16 186 (22.4<i>%</i>) suspected cases, 10567 (14.6<i>%</i>) clinical diagnosed cases (Hubei only), and 889 asymptomatic cases (1.2<i>%</i>)-contributed data for the analysis. Among confirmed cases, most were aged 30-79 years (86.6<i>%</i>), diagnosed in Hubei (74.7<i>%</i>), and considered mild/mild pneumonia (80.9<i>%</i>). A total of 1 023 deaths occurred among confirmed cases for an overall case-fatality rate of 2.3<i>%</i>. 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. A total of 1 716 health workers have become infected and 5 have died (0.3<i>%</i>). <b>Conclusions:</b> 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.","journal":null,"year":null,"id":1765,"datarank":0.0,"base_score":0.0,"endowment":0.0,"self_citation_contribution":0.0,"citation_network_contribution":0.0,"self_endowment_contribution":0.0,"citer_contribution":0.0,"corpus_percentile":0.0,"corpus_rank":765,"citation_count":0,"citer_count":0,"citers_with_citation_signal":0,"citers_with_endowment":0,"datacite_reuse_total":12,"is_dataset":true,"is_dataset_confidence":0.833,"is_oa":false,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":null,"fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[],"reference_count":0,"raw_metadata":{"citation_network_status":"fetched"},"created_at":"2026-03-01T18:20:47.508186Z","pmid":null,"pmcid":null,"fwci":null,"citation_percentile":null,"influential_citations":0,"oa_status":null,"license":null,"views":0,"total_file_size_bytes":0,"version_count":0,"fair_f":null,"fair_a":null,"fair_i":null,"fair_r":null,"fair_zscore":null,"fair_rationale":null,"fair_model":null,"fair_agent_version":null,"fair_fulltext_source":null,"fair_has_llm":null,"fair_computed_at":null,"clinical_trials":[],"software_tools":[],"db_accessions":[],"linked_datasets":[],"topics":[]}