some introductions about covid19 in3-4 sentence for essay writing guys pls help me
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This article is about the group of viruses. For the disease involved in the ongoing COVID-19 pandemic, see COVID-19. For the virus that causes this disease, see Severe acute respiratory syndrome coronavirus 2.
Coronaviruses are a group of related RNA viruses that cause diseases in mammals and birds. In humans and birds, they cause respiratory tract infections that can range from mild to lethal. Mild illnesses in humans include some cases of the common cold (which is also caused by other viruses, predominantly rhinoviruses), while more lethal varieties can cause SARS, MERS, and COVID-19. In cows and pigs they cause diarrhea, while in mice they cause hepatitis and encephalomyelitis.
Orthocoronavirinae
Coronaviruses 004 lores.jpg
Transmission electron micrograph of Avian coronavirus
Illustration of a SARS-CoV-2 virion
Illustration of a coronavirus[2]
Red: spike proteins (S)
Grey: lipid bilayer envelope
Yellow: envelope proteins (E)
Orange: membrane proteins (M)
Virus classificatione
(unranked):
Virus
Realm:
Riboviria
Kingdom:
Orthornavirae
Phylum:
Pisuviricota
Class:
Pisoniviricetes
Order:
Nidovirales
Family:
Coronaviridae
Subfamily:
Orthocoronavirinae
Genera[1]
Alphacoronavirus
Betacoronavirus
Gammacoronavirus
Deltacoronavirus
Synonyms[3][4]
Coronavirinae
Coronaviruses constitute the subfamily Orthocoronavirinae, in the family Coronaviridae, order Nidovirales, and realm Riboviria.[4][5] They are enveloped viruses with a positive-sense single-stranded RNA genome and a nucleocapsid of helical symmetry.[6] The genome size of coronaviruses ranges from approximately 26 to 32 kilobases, one of the largest among RNA viruses.[7] They have characteristic club-shaped spikes that project from their surface, which in electron micrographs create an image reminiscent of the solar corona, from which their name derives.[8]