Novel coronavirus (nCoV) is a provisional name given tocoronaviruses ofmedical significance before a permanent name is decided upon. Although coronaviruses areendemic in humans and infections normally mild, such as thecommon cold (caused byhuman coronaviruses in ~15% of cases),cross-species transmission has produced some unusuallyvirulent strains which can causeviralpneumonia and in serious cases evenacute respiratory distress syndrome anddeath.[1][2][3]
The following viruses could initially be referred to as "novel coronavirus", before being formally named:
| Official name | Other names | Original host[a] | Place of discovery | Disease caused | |
|---|---|---|---|---|---|
| Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)[b][3] | (2019)novel coronavirus (nCoV);[4][5] SARS virus 2; Human coronavirus 2019 (HCoV-19) | pangolins,[6]bats | Wuhan, China | coronavirus disease 2019 (COVID-19)[c][3][7] | |
| Middle East respiratory syndrome–related coronavirus (MERS-CoV)[d] | (2012)novel coronavirus;[8] MERS virus; Middle East virus; camel flu virus | camels,bats | Jeddah, Saudi Arabia | Middle East respiratory syndrome (MERS) | |
| Human coronavirus HKU1 (HCoV-HKU1) | (2004)novel coronavirus;[9] New Haven virus | mice | Hong Kong, China | unnamed, extremely rare, usuallymild variant ofcoronavirus respiratory syndrome | |
| Severe acute respiratory syndrome coronavirus 1 (SARS-CoV-1)[b] | (2002)novel coronavirus;[10][11] SARS virus | civets,bats | Foshan, China | severe acute respiratory syndrome (SARS) | |
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All four viruses are part of theBetacoronavirus genus within the coronavirus family.
The word "novel" indicates a "newpathogen of a previously known type" (i.e. knownfamily) of virus. Use of the word conforms to best practices for naming new infectious diseases published by theWorld Health Organization (WHO) in 2015. Historically, diseases have sometimes been named after locations, individuals, or specific species. However, this practice is now explicitly discouraged by the WHO.[12]
The official permanent names for viruses and for diseases are determined by theICTV and the WHO'sICD, respectively.
At the beginning of theCOVID-19 pandemic in Hubei a 2020 study from theUniversity of Alabama at Birmingham found a more than ten-fold increase in use of expressions such as "Chinese virus" or "Wu flu virus" onTwitter compared to before the outbreak. The researchers voiced concerns whether such terminology could hinder public health efforts or be stigmatizing. No such effects were observed in the wake of theMERS outbreaks being referred to as "Camel flu virus" or "Middle East virus".[13]
Sequence alignment around the RBD supported potential recombination between SARSr-Ra-BatCoV RaTG13 and pangolin-SARSr-CoV/MP789/Guangdong/2019 and the receptor-binding motif region showing exceptionally high sequence similarity to that of pangolin-SARSr-CoV/MP789/Guangdong/2019.