unclear whether these studies will result in effective
interventions, and although the optimistic estimate
of each vaccine study is at least 12-18, these studies
are considered effective ‘(Randolph and Barreiro,
2020).
1.1 Covid-19
Coronavirus (CoV) is part of the Coronaviridae
family. Coronavirus (COVID19) began to spread in
December 2019 and was detected in early January
2020. The virus began to spread in China from mid-
January to late January. The virus spreads in the host
and clinically shows several symptoms, such as the
common cold to respiratory infections ‘(Randolph
and Barreiro, 2020). Covid-19 is an RNA infection
in the form of a royal attribute, having a diameter of
approximately 60- 140 nm. It is transmitted through
inhalation, namely coughing and sneezing. The
Covid-19 virus enters the human nasal system by
inhalation and begins to replicate. The main receptor
for the Covid-19 virus is ACE2. Then the virus starts
to spread with a limited immune response and can be
detected with a feeling of discomfort in the nose.
The COVID-19 virus then spreads and reaches the
human respiratory tract, and the virus faces a more
robust innate immune response. Most Covid-19
patients are elderly/elderly patients, such as lung
disease, hypertension, malignant tumors, coronary
heart disease, and chronic kidney disease
(Ramatillah and Isnaini, 2021).
The Covid-19 virus belongs to the category of
betacoronavirus viruses, such as MERS-CoV and
SARS-CoV-1. The virus comes from animals,
namely bats. The patients in the United States were
similar to those obtained in China, suggesting the
possible emergence of this new virus from animal
reservoirs. There were reports that several pets had
previously tested positive for SARS-CoV-2 in
several countries such as Hong Kong, Belgium, and
New York City zoos (López, de Casas Moreno and
Mera, 2021)
The Covid-19 virus attacks the immunity of
humans. Immunity in humans is the best fortress.
The individual's immune system is divided into three
categories, namely native immunity (quickly),
adaptive immunity (long term), and passive
immunity. The human immune system can detect
and support antibodies, defending against viruses or
invading germs. However, when it first attacks the
body, the immune system cannot work correctly, and
we become sick. Precisely what happened like
Covid-19 (Ramatillah and Isnaini, 2021)
1.2 Symptom
Symptoms in patients with COVID-19 are similar to
Middle East Respiratory Syndrome (MERS),
starting from 2-14 days of exposure to SARS-CoV-2.
Causes such as high body temperature, fatigue, and
phlegm. In a sick person found, there are symptoms
such as weakness, flu, inflammation, and excretion.
These causes are usually easy and start slowly. Some
patients contracted SARS- CoV-2 infection but did
not show any reason and did not feel unwell(López,
de Casas Moreno and Mera, 2021)
A retrospective analysis was performed on
patients in Jinan and Rizhao, Shandong Province,
from January 23 to February 15. There were 53 cases,
including 67 cases with an average age of 41.47 years
(range 21-65 years), and 26 cases (49.1%) were men.
Most cases were mild (8 cases, 15.1%) and
conventional (44 cases, 83%), with only one severe
case (1.9%). The most common symptoms at the
beginning of the illness were fever (60.4%), dry
cough (54.7%), phlegm (37.7%), pharyngitis
(35.8%), and fatigue (32.1%). Less common
symptoms were headache (20.8%), anorexia
(15.1%), myalgia (13.2%), chest pain, (11.3%),
nausea (5.7%), diarrhea (3 .8%), dizziness
(3.8%), and vomiting (1.9%) (Asaduzzaman et al.,
2020).
1.3 Vaccine
Vaccination against (SARS-CoV-2) remains the
main hope in controlling the pandemic (COVID-
19). (WHO) Approves COVID19 Vaccine
Emergency Use List (EUL) contains (mRNA) Pfizer
BNT162b2. BioNTech (Pfizer, Inc; Philadelphia,
PA, USA) and Moderna mRNA vaccine 1273
(MODER) naTX, Inc.; Cambridge, Mass. USA);
Viral vector vaccines (AstraZeneca, Cambridge,
UK) and Janssen Ad26.COV2.S (Janssen Biotech,
Inc; a pharmaceutical company owned by Janssen,
Johnson & Johnson; New Brunswick, NJ, USA);
and
Sinopharm, Inactivated Virus Vaccine (China
National Pharmaceutical Group) and Sinovac
(Sinovac Biotech Ltd.; ‘(Al-Awwal et al., 2022)
AntiCoV2 vaccine was developed in a much shorter
time than previous vaccinations. Previous
vaccinations took 8 to 10 years for human use, while
the antiSARSCoV2 vaccine took 8 to 10 months
(Han et al., 2020)
Most Covid-19 vaccines need to be given in two
doses at intervals of 3-12 weeks to provide sufficient
immunity for recipients of the Janssen vaccine,
currently used as a single dose. The SARSCoV2