The disease was formally named Corona Virus

Running Head: COVID-19 1
Corona Virus
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COVID-19 2
Introduction
In December 2019, a strange disease broke out in Wuhan, China. The disease had
symptoms similar to pneumonia, and it was suspected to have originated from the
Huanan Seafood market (He, Deng & Li, 2020). On January 12th 2020, the World
Health Organization (WHO) named the virus at 2019 novel coronavirus (2019-
nCoV). On February 11th, the WHO met and declared the disease an international
public health epidemic. The disease was formally named Corona Virus (COVID-19).
The disease spread rapidly within Wuhan City, and by mid-January, the virus had
spread to other parts of China. This forced a lockdown in significant cities in the
country. By March 25th 2020, the disease had spread to almost all parts of the globe,
and it had killed more than 15,000 people and infected more than 800,000 others.
Origin of SARS-CoV-2
SARS-CoV-2 is a virus that belongs to the coronavirus family of viruses. This is
the third known zoonotic coronavirus disease after the Middle East Respiratory
Syndrome(MERS), and the SARS also broke out in China (Zhou et al., 2020). Many
scientists indicate that the virus came from the Huanan seafood market, which is one
of the largest market trading in wild meat. A study conducted by Sun P et al., (2020),
showed that the virus was a chronic disease between a coronavirus from a bat and
another type of coronavirus whose origin is unknown. Scientists carried out studies
and established that the sequence of homology between Covid -19 and SARS-CoV
was 79% (She et al., 2020), This, therefore, means that current evidence indicates that
the virus originated from bats. Still, the intermediate host is yet to be identified.

COVID-19 3
Mechanisms and symptoms of COVID-19 on the respiratory system
The receptor of the SARS-CoV-2 is angiotensin-converting enzyme two called
(ACE2) (Shetty, 2020). In the human lungs, ACE2 is expressed as type 1 and type 2
alveolar epithelial cells. When COVID -19 attacks a human body, it targets the ACE2
and hence leading to damage to the alveolar cells. The damage of alveolar cells brings
about a series of complications such as problems in breathing and therefore causing
severe inflammation of the lungs or even death (Zhang et al., 2020). The alveolar cells
are also found in tissues such as the heart, liver, kidney, and digestive organs. These
organs are also attacked by the virus and hence explaining why some patients also
suffer complications such as myocardial injury, arrhythmia, and kidney
complications.
Symptoms
COVID-19 is associated with several symptoms. One of these symptoms is that
the virus is high fever. A person with the illness will experience abnormal upper body
temperature and fatigue. A person might also start coughing and sneezing as well as
experiencing breathing difficulties (Li, 2020). The symptoms of the virus as very
similar to that of pneumonia and MERS-CoV.
Complications and severity degree of covid-19 on the respiratory system
COVID-19 appears as an asymptomatic carrier state, acute respiratory disease,
and pneumonia. It takes approximately 14 days for symptoms of the disease to appear
and for the virus to be tested successfully. During this period, a person can transmit
the virus to other people. This, therefore, explains the high rate of infections which
are multiplying globally. Clinical manifestation of the virus is a protein which