- Health
The 2019 coronavirus outbreak is caused by a novel virus, past mentions of coronaviruses refer to different strains
Key takeaway
Many coronavirus strains have already been discovered, but new strains regularly emerge due to mutations. The particular coronavirus responsible for the outbreak originating in Wuhan, China, provisionally named 2019-nCoV, is a new strain that was identified by scientists after sequencing its genome. Currently no vaccine is available against COVID-19.
Reviewed content
Verdict detail
Misrepresents source: Several coronavirus strains have been patented or referenced in the labeling of animal vaccines and disinfectants, such as Lysol. However, the 2019 outbreak was caused by a new coronavirus strain which emerged more recently.
Imprecise: The term “coronavirus” refers to a large and diverse group of viruses, not a single virus.
Full Claim
coronavirus is not a new virus
Review
This claim, which states that the “coronavirus is not a new virus”, has been published in numerous viral Facebook posts referencing the outbreak that originated in Wuhan, China, at the end of 2019 and has been provisionally named 2019-nCoV. These posts cite the existence of patents for completely different strains of coronaviruses such as SARS-CoV-1, which causes severe acute respiratory syndrome (SARS), and the avian infectious bronchitis virus as proof that 2019-nCoV existed before 2019. In addition, some product labelling on animal vaccines and virus-killing disinfectants, such as Lysol, which list “coronavirus” as one of the microorganisms it kills as further evidence.
These claims mistakenly assume that 2019-nCoV is the same strain of coronavirus as those that cause SARS or avian infectious bronchitis. In fact, the name “coronavirus” refers to a large and diverse group of viruses which include a group called “human coronaviruses”, none of which have caused the current 2019 outbreak. As the name indicates, human coronaviruses infect humans and some are known to cause severe respiratory illness, such as SARS and MERS, while others cause the common cold. And since 2019-nCoV was only recently discovered, the inclusion of the term “coronavirus” on disinfectant product labeling in no way suggests that such products can combat this virus or that the virus had been previously identified.
Over time, mutations occurring in viruses give rise to new strains of coronaviruses that were not previously identified in humans—the current outbreak that originated in Wuhan has been recognised as a new coronavirus strain by scientists who sequenced its genome[1,2].
The exact source of 2019-nCoV remains unknown. However, given the fact that many animals, such as bats and snakes, host coronaviruses that can be transmitted to humans, and that the 2003 SARS outbreak was linked to civet cats, scientific evidence points to 2019-nCoV as a virus of animal origin. Preliminary work by researchers show that 2019-nCoV has a high degree of genetic similarity with coronaviruses of bat origin[2,3].
In summary, there are many coronaviruses that were identified long before the current outbreak, however this does not preclude new strains from emerging over time due to mutations. Care should be taken not to conflate references to well-known and characterized coronaviruses with references to novel strains.
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FactCheck.org checked a similar claim by Facebook users, which used a photo of an existing canine coronavirus vaccine to suggest that there is already a vaccine against the virus causing the COVID-19 pandemic, finding it to be false.
[Scientific research on 2019-nCoV is ongoing. This review will be updated as new information becomes available.]
REFERENCES
- 1 – Zhu et al. (2020) A Novel Coronavirus from Patients with Pneumonia in China, 2019. New England Journal of Medicine.
- 2 – Lu et al. (2020) Genomic characterisation and epidemiology of 2019 novel coronavirus: implications for virus origins and receptor binding. The Lancet.
- 3 – Zhou et al. (2020) A pneumonia outbreak associated with a new coronavirus of probable bat origin. Nature.
