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RNA is usually generated from DNA as part of cell replication.
Retroviruses are "retro" because they reverse the direction of the normal gene copying process. The virus genes are copied into the DNA where it replicates thru the normal cell replication process which ends up making viral proteins.
Viruses require a living host to replicate as opposed to bacteria which are larger single-celled microorganisms that can survive on their own.
It causes potentially deadly diseases in mammals and birds.
An Pandemic of SARS (Severe acute respiratory syndrome), a type of coronavirus, affected 26 countries and resulted in more than 8000 cases in people from November 2002 to July2003, when the global outbreak was declared over.
Google "How was SARS eradicated?""
The SARS-CoV-2 virus is responsible for the COVID-19 disease.
(Just like HIV is responsible for AIDS)
In late 2017, Chinese scientists traced SARS to cave-dwelling horseshoe bats in Wuhan province.
As of February 2020 the search for the animal origin of COVID-19 is ongoing.
MERS (Middle East Respiratory Syndrome), another kind of coronavirus was first identified in Saudi Arabia in 2012 in people displaying symptoms of fever, cough, shortness of breath and occasionally gastrointestinal problems such as diarrhoea.
On 30 December 2019 bronchoalveolar lavage samples were collected from a patient with pneumonia of unknown etiology in Wuhan province, China . It analyzed positive for pan-Betacoronavirus, one of 4 genuses of corona virus which includes SARS .
First called NCP - Novel Coronavirus Pneumonia,
On February 11th 2020 the WHO (World Health Organization) announced that "COVID-19" will now be the official name of the disease caused by the new coronavirus from China.
"CO" stands for "corona", "VI" for "virus" and "D" for "disease",.
The agency had earlier given the virus the temporary name of "2019-nCoV acute respiratory disease".
Timeline per John Hopkins Day 0 Infection Incubation - Median 5 days. 97.5% will show symptoms by 11.5 days. Contagious 2-3 Days before Symptoms 5-10 Symptoms - Fever, fatigue, muscle pain, dry cough 6-12 Difficulty breathing 11-16 Hospital for those with still breathing troubles 12 Acute respiratory distress 14 ICU for critical respiratory issues 16 Fever ends 17 Shortness of breath ends 22 Death for those worst affected 26 Recovered Source: How long does coronavirus last – from incubation to recovery – The Sun April 8
Flu vs Coronavirus:
Group IV: Single-stranded RNA viruses - Positive-sense Main article: positive-sense ssRNA virus The positive-sense RNA viruses and indeed all RNA defined as positive-sense can be directly accessed by the host ribosomes immediately to form proteins. These can be divided into two groups, both of which reproduce in the cytoplasm:
Viruses with polycistronic mRNA where the genome RNA forms the mRNA and is translated into a polyprotein product that is subsequently cleaved to form the mature proteins. This means that the gene can utilize a few methods in which to produce proteins from the same strand of RNA, all in the sake of reducing the size of its gene.
Viruses with complex transcription, for which subgenomic mRNAs, ribosomal frameshifting, and proteolytic processing of polyproteins may be used. All of which are different mechanisms with which to produce proteins from the same strand of RNA.
Examples of this class include the families Astroviridae, Caliciviridae, Coronaviridae, Flaviviridae, Picornaviridae, Arteriviridae, and Togaviridae.
Source: Baltimore classification - Wikipedia