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Betacoronavirus hongkonense [1] ( commonly called Human coronavirus HKU1 abbreviated as HCoV-HKU1) is a species of coronavirus in humans and animals. It causes an upper respiratory disease with symptoms of the common cold, but can advance to pneumonia and bronchiolitis. [2]
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.
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Coronaviruses are known for their shape resembling a stellar corona, such as that of the Sun visible during a total solar eclipse; corona is derived from Latin corōna 'garland, wreath, crown'. [6]
The spikes are the most distinguishing feature of coronaviruses and are responsible for the corona- or halo-like surface. On average a coronavirus particle has 74 surface spikes. [53] Each spike is about 20 nm long and is composed of a trimer of the S protein. The S protein is in turn composed of an S1 and S2 subunit.
A fast-moving brush fire that erupted Tuesday in Los Angeles threatened homes and sent thousands of residents fleeing, prompting city and state officials to declare a state of emergency.
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.