short essay on covid-19
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Explanation:
Currently the entire world is experiencing the desolation and
devastation of a deadly virus, the new disease of COVID-19,
emerging from the new coronavirus SARS-CoV 2, has spread
throughout the world, affecting more than 200 countries and
hundreds of people, with discouraging morbidity and mortality
figures.
All this started at the end of December 2019, specifically on the
31st, where the Chinese Disease Control Center reported 27
cases of patients with pneumonia of uncertain etiology and who
had in common a Hunan seafood market that it lacked sanitary
measures, warning of a possible zoonosis.
On January 7 its causal agent was identified, which was a
coronavirus and it was called with the name of the new
coronavirus (2019-nCoV). The researchers delimited the 2019-
nCoV sequence with that of other viruses through a database of
genetic sequences, discovering that the most related were two
viruses of Chiroptera origin as indicated by their scientific name
(bats), (bat-SL -CoVZC45 and bat-SLCoVZXC21). However, their similarities were less than 90%, therefore, it was suggested that
there was the possibility that there was another animal reservoir
that acted as an intermediary between bats and humans. On
February 11, the WHO coined the name SARS-CoV 2 and until
March 11 it was declared by the same entity as a pandemic.
The clinical picture of patients with COVID-19 has a pattern of
respiratory dominance and depends on the tropism of the virus
towards the target organs of the body, because SARSCoV-2 uses
the ACE-2 receptor for its entry into the host cell . The virus binds
ACE-2 with an affinity 10-20 times greater than SARS-CoV. This
receptor is highly expressed in multiple body tissues, including
lung, gastrointestinal, kidney and cardiac tissue, explaining the
symptoms present in the prodrome of the disease.
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