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COVID-19 is the deadliest pandemic in US history; [360] it was the third-leading cause of death in the US in 2020, behind heart disease and cancer. [361] From 2019 to 2020, US life expectancy dropped by 3 years for Hispanic Americans, 2.9 years for African Americans, and 1.2 years for white Americans. [362]
The earliest reports of a coronavirus infection in animals occurred in the late 1920s, when an acute respiratory infection of domesticated chickens emerged in North America. [15] Arthur Schalk and M.C. Hawn in 1931 made the first detailed report which described a new respiratory infection of chickens in North Dakota.
This was a historic event in the history of the United States schooling system because it forced schools to shut-down. At the very peak of school closures, COVID-19 affected 55.1 million students in 124,000 public and private U.S. schools. [1] The effects of widespread school shut-downs were felt nationwide, and aggravated several social ...
The COVID-19 pandemic affected educational systems across the world. [ 1 ] The number of cases of COVID-19 started to rise in March 2020 and many educational institutions and universities underwent closure. Most countries decided to temporarily close the educational institutions in order to reduce the spread of COVID-19.
SARS-CoV-2 is the seventh known coronavirus to infect people, after 229E, NL63, OC43, HKU1, MERS-CoV, and the original SARS-CoV. [105] Like the SARS-related coronavirus implicated in the 2003 SARS outbreak, SARS‑CoV‑2 is a member of the subgenus Sarbecovirus (beta-CoV lineage B). [106] [107] Coronaviruses undergo frequent recombination. [108]
When COVID-19 reached the United States, the original required quarantine was 14 days of length, and later was shortened to 10 days, then 7 days, and eventually even 5 days in some places. Researchers have conducted studies using a variety of methods to analyze the statistical data behind the transmission risks.
As of 2023, the COVID-19 pandemic is an ongoing global pandemic of coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS CoV‑2). Its impact has been broad, affecting general society, the global economy, culture, ecology, politics, and other areas.
The COVID-19 pandemic has had an impact on the environment, with changes in human activity leading to temporary changes in air pollution, greenhouse gas emissions and water quality. As the pandemic became a global health crisis in early 2020, various national responses including lockdowns and travel restrictions caused substantial disruption to ...
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