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The transmission of COVID-19 is the passing of coronavirus disease 2019 from person to person. COVID-19 is mainly transmitted when people breathe in air contaminated by droplets/aerosols and small airborne particles containing the virus. Infected people exhale those particles as they breathe, talk, cough, sneeze, or sing.
On 10 June, the WHO reported that research was continuing to determine how the COVID-19 virus can be transmitted by people who show no symptoms of the disease (asymptomatic transmission). [ 101 ] On 11 June, the WHO Africa regional office warned that COVID-19 was accelerating in Africa, with more than 200,000 cases and more than 5,600 deaths.
Coronavirus disease 2019 (COVID-19) is a contagious disease caused by the coronavirus SARS-CoV-2. In January 2020 the disease spread worldwide, resulting in the COVID-19 pandemic. The symptoms of COVID‑19 can vary but often include fever, [7] fatigue, cough, breathing difficulties, loss of smell, and loss of taste.
A COVID-19 vaccine is intended to provide acquired immunity against severe acute respiratory syndrome coronavirus 2 (SARS‑CoV‑2), the virus that causes coronavirus disease 2019 . Prior to the COVID-19 pandemic, an established body of knowledge existed about the structure and function of coronaviruses causing diseases like severe acute ...
A September 2020 review noted the hypothetical possibility that the COVID-19 infection had already spread to Europe in 2019 by presumptive evidences including pneumonia case numbers and radiology in France and Italy in November and December. [1]
As of February 23, fourteen COVID-19 cases had been diagnosed from six states: Arizona -1 case, California -8, Illinois -2, and Massachusetts, Washington, and Wisconsin, 1 case each). Twelve of the cases were related to travel to China, and two occurred through person-to-person transmission from close household contacts with confirmed COVID-19.
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SARS-CoV-2, the causative agent of COVID-19, was first introduced to humans through zoonosis (transmission of a pathogen to a human from an animal), and a zoonotic spillover event is the origin of SARS-CoV-2 that is considered most plausible by the scientific community.