internet: COVID-19 lab leak theory

Evidence: 100 • authority: 72

A highly controversial hypothesis holds that SARS-CoV-2, the virus responsible for the COVID-19 pandemic, originated from a laboratory. The scientific consensus is that the virus is not the result of genetic engineering; instead, most scientists believe it spread to human populations through natural zoonotic transmission from bats, similar to the SARS-CoV-1 and MERS-CoV outbreaks and other pandemics throughout human history. Available evidence indicates that SARS-CoV-2 was originally harbored by bats and transmitted to humans through infected wild animals serving as intermediate hosts at the Huanan Seafood Market in Wuhan, Hubei, China, in December 2019. Several candidate animal species hav…

Evidence: 47 • authority: 72

The COVID-19 pandemic in China is part of the worldwide pandemic of coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). China was the first country to experience an outbreak of the disease, the first to impose drastic measures in response (including lockdowns and face mask mandates), and one of the first countries to bring the outbreak under control. The first wave of the disease manifested as the 2019–2020 COVID-19 outbreak in mainland China, beginning with a cluster of mysterious pneumonia cases, mostly related to the Huanan Seafood Market, in Wuhan, the capital of Hubei province. It was first reported to the local government on 27 D…

Evidence: 35 • authority: 92

Geographical and temporal trends of HIV-1 subtypes and drug resistance in China: a nationwide study over two decades (2003-2024).. Objective. This study aims to characterize the 20-year trends in human immunodeficiency virus 1 (HIV-1) subtypes and circulating recombinant forms (CRFs) in China, as well as patterns of transmitted drug resistance (TDR) to antiretroviral therapies commonly used in clinical practice. Methods. We analysed HIV-1 sequences from 81,563 individuals living in China between 2003 and 2024. Subtypes and CRFs were classified using COMET V2.4. Among these, pol gene sequences from 41,486 treatment-naïve individuals were used to assess TDR via the Stanford HIVdb genotypic re…

Evidence: 35 • authority: 72

The global COVID-19 pandemic (also known as the coronavirus pandemic), caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), began with an outbreak in Wuhan, China, in December 2019. It spread to other parts of Asia and then worldwide in early 2020. The World Health Organization (WHO) declared the outbreak a public health emergency of international concern (PHEIC) on 30 January 2020 and assessed it as having become a pandemic on 11 March. The WHO declared that the public health emergency caused by COVID-19 had ended in May 2023, while noting that COVID-19 continued to be a global health threat. COVID-19 symptoms range from asymptomatic to deadly, but most commonly include…

Evidence: — • authority: 92

Transportation control and epidemic containment: empirical evidence from China's Wuhan lockdown.. Background The rapid development of modern transportation networks, coupled with increasing urbanization and population mobility, presents a dual challenge for global public health systems: while enhancing connectivity and economic integration, these networks also accelerate the spatial dissemination of infectious diseases. The COVID-19 pandemic, which emerged in Wuhan, China, in late 2019, starkly illustrated this paradox. As a major national transportation hub with dense high-speed rail (HSR) connectivity, Wuhan exemplifies how modern transport infrastructure can facilitate the rapid intercit…

Evidence: — • authority: 92

Epidemiological characteristics and importation patterns of imported dengue fever in southwest border regions of China.. Dengue fever is a global public health issue of international concern. The southwestern border regions of China (Yunnan Province) are an important gateway for imported dengue fever cases in China. This study aims to investigate the importation patterns of imported dengue cases in Yunnan Province to support global dengue prevention efforts. This study examined imported dengue cases in Southwestern border regions of China, comparing actual and predicted cases via a counterfactual model under COVID-19 measures. Social network analysis was used to identify the importation pat…

Evidence: — • authority: 92

Assessing spatial transmission risk of respiratory infectious diseases across cities of different socioeconomic tiers in China: A modelling study.. Background Understanding how respiratory infectious diseases spread across cities of different socioeconomic tiers is crucial for regionally targeted interventions. However, most spatial prediction frameworks neglect the combined influence of urban hierarchy and human mobility in shaping transmission risk. Methods and findings We integrated large-scale intercity mobility data into an agent-based branching process model to simulate the spatial diffusion of respiratory pathogens across mainland China. Three COVID-19 outbreaks were used for validat…

Evidence: — • authority: 72

The COVID-19 pandemic in Taiwan was a part of the worldwide pandemic of coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). As of 19 March 2023 in Taiwan, 10,231,343 are confirmed cases, including 18,775 deaths. The virus was confirmed to have spread to Taiwan on 21 January 2020, with the first case being a 50-year-old woman who had been teaching in Wuhan, China. The Taiwanese government integrated data from the national health care system, immigration, and customs authorities to aid in the identification and response to the virus. Government efforts are coordinated through the National Health Command Center (NHCC) of the Taiwan Center…

Evidence: — • authority: 72

During the COVID-19 pandemic in mainland China, the Chinese Communist Party (CCP) and government of China under CCP general secretary Xi Jinping's administration pursued a zero-COVID strategy to prevent the domestic spread of COVID-19 until late 2022. Aspects of the response have been controversial, with the zero-COVID approach being praised and the government's lack of transparency, censorship, and spread of misinformation being criticized. The government abandoned its zero-COVID policy on 7 December 2022. After discovery of a cluster of patients with pneumonia of unknown etiology in Wuhan, Hubei Province, a public notice on the outbreak was distributed on 31 December 2019. Three days earl…

Evidence: — • authority: 88

COVID‐19 pandemic: a review of smart cities initiatives to face new outbreaks. While the world still struggles against the devastating effects of the COVID‐19 pandemic, governments and organisations are discussing how new technologies can be exploited to relieve its impacts and how future pandemics can be avoided or minimised. Among the envisioned solutions, the development of more efficient and widespread smart city initiatives can improve the way critical data is retrieved, processed, stored, and disseminated, potentially improving the detection and mitigation of outbreaks while reducing the execution time when taking critical actions. In fact, some first responses to this pandemic are ex…

Evidence: — • authority: 72

The COVID-19 pandemic in mainland China is part of the worldwide pandemic of coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). China was where the first COVID outbreak occurred, the first where authorities imposed drastic measures in response (including lockdowns and face mask mandates), and was one of the first countries to bring the outbreak under control, at least temporarily. The 2019–2020 COVID-19 outbreak in mainland China was the first wave of the disease, and was first manifested as a cluster of mysterious pneumonia cases, mostly related to the Huanan Seafood Market in Wuhan, the capital of Hubei province. It was first report…

Evidence: — • authority: 72

On 23 January 2020, the Chinese Communist Party (CCP) and the State Council of China imposed a lockdown in Wuhan and other cities in Hubei in an effort to quarantine the center of an outbreak of COVID-19; this action was commonly referred to as the Wuhan lockdown (Chinese: 武汉封城; pinyin: Wǔhàn fēng chéng). The World Health Organization (WHO), although stating that it was beyond its own guidelines, commended the move, calling it "unprecedented in public health history". CCP general secretary Xi Jinping said he personally authorized the unprecedented lockdown of Wuhan and other cities beginning on 23 January. The lockdown in Wuhan set the precedent for similar measures in other Chinese cities.…