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The ongoing COVID-19 pandemic began in the U.S. state of Illinois on January 24, 2020, when a woman in Chicago, who had just returned from the pandemic 's place of origin in Wuhan, Hubei, China, tested positive for the virus. [ 2 ] This was the second case of COVID-19 in the United States during the pandemic.
The international pictogram for oxidizing chemicals. Dangerous goods label for oxidizing agents. An oxidizing agent (also known as an oxidant, oxidizer, electron recipient, or electron acceptor) is a substance in a redox chemical reaction that gains or "accepts"/"receives" an electron from a reducing agent (called the reductant, reducer, or electron donor).
Disinfectant. Disinfection of a floor using disinfectant liquid applied using a mop. Levels of resistance of microbes to disinfectants. A disinfectant is a chemical substance or compound used to inactivate or destroy microorganisms on inert surfaces. [1] Disinfection does not necessarily kill all microorganisms, especially resistant bacterial ...
Scientifically accurate atomic model of the external structure of SARS-CoV-2. Each "ball" is an atom. The United States ' response to the COVID-19 pandemic with consists of various measures by the medical community; the federal, state, and local governments; the military; and the private sector.
An N95 respirator is a disposable filtering facepiece respirator or reusable elastomeric respirator filter that meets the U.S. National Institute for Occupational Safety and Health (NIOSH) N95 standard of air filtration, filtering at least 95% of airborne particles that have a mass median aerodynamic diameter of 0.3 micrometers under 42 CFR 84, effective July 10, 1995.
Updated September 23, 2024 at 11:00 AM. The side effects of newly discovered COVID-19 strain XEC might not be as severe, but is part of the more contagious variant class, experts say. The Centers ...
States, territories, and counties that issued a stay-at-home order in 2020. State, territorial, tribal, and local governments responded to the COVID-19 pandemic in the United States with various declarations of emergency, closure of schools and public meeting places, lockdowns, and other restrictions intended to slow the progression of the virus.
Coronavirus envelope protein. The envelope (E) protein is the smallest and least well-characterized of the four major structural proteins found in coronavirus virions. [ 2 ][ 3 ][ 4 ] It is an integral membrane protein less than 110 amino acid residues long; [ 2 ] in SARS-CoV-2, the causative agent of Covid-19, the E protein is 75 residues long ...