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last updated 18 May 2020
Background:
Terminology - Cronology:
First described in detail in the 1960s, the coronavirus gets its name from a distinctive corona or 'crown' of sugary-proteins that projects from the envelope surrounding the particle.
SARS-CoV-2 is a type of single stranded enveloped positive-sense RNA (Ribonucleic acid) (ssRNA(+) retrovirus like SARS, MERS and HIV -- One of 7 classes of viruses. See Group IV: Single-stranded RNA viruses - Posite sense below

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.
Symptoms vary.

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.

COVID-19 origin:
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".


Symptoms:
Coronavirus Symptoms Examples - Worldometer
Stages:
Terms:
Asymptomatic - Infected people who never show symptoms. 13% Dyspnea - Difficult or labored breathing. Fomites - objects or materials which are likely to carry infection, such as clothes, utensils, and furniture. Hypoxia - A condition in which the body or a region of the body is deprived of adequate oxygen supply at the tissue level. It can show up as a change in skin color. It can damage organs. Latency - Clinical Latency - Basically the same as incubation as far as I know. Viral Latency - Virus becomes inactive but still exists. Pre-Symptomatic - Infected people with no symptoms who will develop them later. Source: Management of Patients with Confirmed 2019-nCoV | CDC April 3, 2020 version
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:
  • Covid-19 vs the Flu


    Humidity - Temperature:
    There is a school of thought that says,
    "Infections may subside in the summer because of higher temperatures and humidity."
    Medical people note that flu declines in the summer this may be the reason.
    There is some data to support this for coronavirus, but it is inconclusive.
    Several theories exist: Literature Review of the Effect of Temperature and Humidity on Viruses | NIH, 2011
    Vulnerability or Risk Factors for serious complications or death.
    Case Fatality Rate (CFR): Over 80 years old (CFR 14.8%) cardiovascular disease (CFR 13.2%), diabetes (9.2%), chronic respiratory disease (8.0%), hypertension (8.4%), and cancer (7.6%).
    See Case Fatality Rate (CFR)
    Group IV & V: Single-stranded RNA viruses:
    The ssRNA viruses belong to Class IV or V of the Baltimore classification. They could be grouped into positive sense or negative sense according to the sense of polarity of RNA. The single stranded RNA is the common feature of these viruses. The replication of viruses happens in the cytoplasm or nucleus (for segmented class V viruses). Class IV and V ssRNA viruses do not depend as heavily as DNA viruses on the cell cycle.[clarification needed]

    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


    More Links:
    High Humidity Leads to Loss of Infectious Influenza Virus from Simulated Coughs | PLos ONE
    Literature Review of the Effect of Temperature and Humidity on Viruses
    These are 6 of the main differences between flu and coronavirus - MIT Technology Review
    We Are 100 Times Safer Now Than In Early March: Here is the Math
    Pandemics
    General virology – Knowledge for medical students and physicians
    Are RNA Viruses Candidate Agents for the Next Global Pandemic? A Review | ILAR (Institute for Laboratory Animal Research) Journal | Oxford Academic 2017