A novel coronavirus, the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), causing the Coronavirus Disease 2019 (COVID-19), has emerged in late 2019 and ongoing pandemic in many countries and territories. It was first identified in Wuhan City, Hubei Province, China. It can be transmitted from human-to-human by respiratory droplets from sneezing, coughing and aerosols, with symptomatic people being the major source of transmission. Coronaviruses make up a large family of viruses that can infect birds and mammals, including humans, according to World Health Organization (WHO). A coronavirus is an enveloped virus having non-segmented positive-sense RNA genome and belongs to the family Coronaviridae and the order Nidovirales. Coronaviruses are spherical in shape with club-shaped spike projections emanating from the surface which look like halos or a crown under the electron microscope and hence the name coronavirus. Amongst positive-strand RNA viruses Coronaviruses have the highest known frequency of recombination. Coronaviruses infect a wide variety of host species. Coronavirus infection in humans is commonly associated with mild to severe respiratory diseases that are characterized by high fever, severe inflammation, cough, and internal organs dysfunction that can even lead to death.
Keywords:Pandemic, SARS-CoV-2, Zoonotic, Antibody, Mutations
In present moment, a novel coronavirus, the SARS-CoV-2 (Severe Acute Respiratory Syndrome Coronavirus 2) causing the Coronavirus Disease 2019 (COVID-19), has emerged in late 2019, which has posed a global health threat with its ongoing pandemic in many countries and territories . Health workers worldwide are currently making efforts to control further disease outbreaks caused by the novel CoV (originally named 2019-nCoV) that was first identified inWuhan City, Hubei Province, China, on December 12th, 2019 . On February 11th, 2020, the World Health Organization (WHO) announced the official designation for this current CoVassociated disease to be “COVID-19”, caused by the SARS-CoV-2 . Alpha CoVs and beta CoVs originated from bats and rodents while delta CoVs and gamma CoVs have their origins from avian species . The beta CoVs including SARSCoV-1 was isolated from bats in 1992 with civet cats being the intermediary host; MERS-CoV was isolated from dometry camels in 2003; and of course, the currently circulating SARS-CoV-2 formally referred to as 2019 novel coronavirus (2019-nCoV) causing COVID-19 . SARS-CoV-2 has a pleomorphic and circular structure with a diameter of about 60-140 nm. It can be transmitted from human-to-human by respiratory droplets from sneezing, coughing and aerosols, with symptomatic people being the major source of transmission . CoVs belong to the familyCoronaviridae(subfamily Coronavirinae), the members ofwhich infect a broad range of hosts, producing symptoms and diseases ranging from acommon cold to severe and ultimately fatal illnesses such as SARS, MERS, and, as of present, COVID-19 . The SARS-CoV-2 (formerly 2019-nCoV) is considered as one of the seven members of the CoV family that infect humans (3), and it belongs to the same lineage of CoVs that causes SARS; however, this novel virus is genetically distinct . Jonsdottir and Dijkman  reported that six CoVs were known to infect humans include HCoV-229E, HCoV-NL63, HCoV-OC43, HCoV-HKU1, SARS-CoV, and MERS-CoV. The COVID-19 that emerged in China spread rapidly throughout the country and subsequently to other countries. Due to the severity of this outbreak and the potential of spreading on an international scale, the WHO declared a “global health emergency” on January 31st, 2020 . Subsequently, on March 11th, 2020, a pandemic situation wasdeclared. At present, we are not in a position to effectively treat COVID-19 since neither approved vaccine nor specific antiviral drugs for treating human CoV infections are available . Most nations are currently making efforts to prevent further spreading of this potentially deadly virus by implementing preventive andcontrol strategies.Coronaviruses make up a large family of viruses that can infect birds and mammals, including humans, according to world health organization . The present comprehensive review describes the various features of the COVID-19 (caused by the SARS-CoV-2) causing the current disease outbreaks, advances in diagnosis and developing vaccines and therapeutics.
Desforges et al.  reported that a Coronavirus is an enveloped virus having non-segmented positive-sense RNA genome and belongs to the family Coronaviridae and the order Nidovirales which is broadly distributed in humans, other mammalsand birds causing respiratory, enteric, hepatic and neurologic diseases(Figure 1). Coronaviruses are further classified into four genera namely alpha, beta, gamma and delta, of which only alpha and beta varieties are known to cause infections in humans . Until recentdecades, human corona viruses were considered inconsequential pathogens rarely causing any disease more severe than the common cold and four alpha HCoVs (HCoV 229E, NL63, OC43 and HKU1) accounted for 10-30 percent of colds (upper respiratory tract infections) worldwide . However, relatively recently two new varieties of beta coronaviruses werediscovered known as SARS CoV and MERS CoV, which are zoonotic in origin and found to cause severe lower respiratory disease with fatal consequences in humans . Corona viruses are spherical in shape with club-shaped spike projections emanating from the surface which look like halos or a crown under the electron microscope and hence the name coronavirus. A coronavirus typical generic genome is 32 kilobases long and is the largest known RNA virus genome . Woo et al.  reported that amongst positive-strand RNA viruses, Coronaviruses have the highest known frequency of recombination. On infecting a host, it rapidly and indiscriminately combines genetic information from different sources and also known for its ability to recombine using both homologous and non-homologous recombination which presumably plays a key role in virus evolution . Sanjuán and Calap  reported that the average evolutionary rate for coronaviruses is roughly 10-4 nucleotide substitutions per site per year, with mutations taking place during every replication cycle. In other words, these viruses have a tendency of mutating and changing at a high rate, wreaking havoc for both, diagnosis as well as treatment and vaccine regimens.
MECHANISM OF BINDING TO HOST CELL
Coronaviruses infect a wide variety of host specie . Ryu  reported that the life cycle of the virus with the host consists of the following 5 steps: Attachment, penetration, biosynthesis, maturation and release. Once viruses bind to host receptors (attachment), they enter host cells through endocytosis or membrane fusion (penetration). Payne  reported that when viral contents are released inside the host cells, viral RNA enters the nucleus for replication and make viral proteins. Then, new viral particles are made (maturation) and released . Shoeman and Feilding  reported that corona viruses consist of four structural proteins; Spike (S), membrane (M), envelop (E) and nucleocapsid (N). Fang  reported that spike is composed of a transmembrane trimetric glycoprotein protruding from the viral surface, which determines the diversity of corona viruses and host tropism. Spike comprises two functional subunits; S1 subunit is responsible for binding to the host cell receptor and S2 subunit is for the fusion of the viral and cellular membranes . Kuhn et al.  reported that the angiotensin converting enzyme 2 (ACE2) was act as a functional receptor for SARS-CoV. ACE2 expression was high in lung, heart, ileum, kidney and bladder and in lung, ACE2 was highly expressed on lung epithelial cells . Following the binding of SARS-CoV2 to the host protein, the spike protein undergoes protease cleavage . Jaimes et al.  reviewed a two-step sequential protease cleavage to activate spike protein of SARSCoV and MERS-CoV was proposed as a model, consisting of cleavage at the S1/S2 cleavage site for priming and a cleavage for activation at the S′2 site, a position adjacent to a fusion peptide within the S2 subunit. Kirchdoerfer et al.  reported in his journal that after cleavage at the S1/S2 cleavage site, S1 and S2 subunits remain non-covalently bound and the distal S1 subunit contributes to the stabilization of the membrane-anchored S2 subunit at the prefusion state and subsequent cleavage at the S′2 site presumably activates the spike for membrane fusion via irreversible, conformational changes. Yuki et al.  reviewed the characteristics unique to SARS-CoV-2 among coronaviruses is the existence of furin cleavage site (“RPPA” sequence) at the S1/S2 site and the S1/S2 site of SARS-CoV-2 was entirely subjected to cleavage during biosynthesis in a drastic contrast to SARS-CoV spike, which was incorporated into assembly without cleavage.
ORIGIN, SPREAD AND EMERGENCE OF COVID-19
The possible origin of this novel virus and the first mode of disease transmission are not yet identified . Analysis of the initial cluster of infections suggests that the infected individuals had a common exposure point, the seafood market in Wuhan, Hubei Province, China . Tiwari et al.  reported that the Huanan South China Seafood Market also sells live animals such as poultry, bats, snakes, and marmots. This might be the point where zoonotic (animal-to-human) transmission might have occurred . Although the SARS-CoV-2 is suspected to be originating from an animal host (zoonotic origin) with the further human-to-human transmission, the possibility of food-borne transmission should be ruled out with further investigations, since it is a latent possibility . Aliabadi et al.  reported that other potential and expected routes would be associated with the transmission, as in other respiratory viruses, by direct contact, shaking contaminated hands, or by direct contact with contaminated surfaces. Bizzoca et al.  reported that it is still, to be better defined, yet need to be answered if blood transfusion and organ transplantation as well as transplacental and perinatal routes, would be possible for SARS-CoV-2 transmission.
CORONA VIRUSES (COV) IN HUMANS
Coronavirus infection in humans is commonly associated with mild to severe respiratory diseases that are characterized by high fever, severe inflammation, cough, and internal organs dysfunction that can even lead to death . WHO  reported that coronaviruses can spread in the following ways:
Coughing and sneezing without covering the mouth can disperse droplets into the air, touching or shaking hands with a person who has the virus can pass the virus between individuals, making contact with a surface or object that has the virus and then touching the nose, eyes, or mouth. The National Institutes of Health (NIH) suggest that several groups of people have the highest risk of developing complications due to COVID-19.
These groups include:
1. Young children
2. People aged 65 years or older
3. Women who are pregnant
Mackenzie and Smith  reportedwith the outbreaks of other coronaviruses like SARS and MERS suggests that the mode of transmission in COVID-19 can be mainly human-to-human transmission occurs through direct contact, droplets, and fomites.Doremalenand Bushmaker  reported that studies on the aerosol and surface stability of SARS-CoV demonstrated that aerosol and fomite transmission of SARS-CoV-2 is feasible, as the virus can remain viable in aerosols for multiple hours and on surfaces up to days. Lauer et al.  reported that the longest predicted incubation time of SARS-CoV-2 (COVID-19) is 14 days. Hence, suspected individuals are isolated for 14 days to avoid the risk of further spread. Dhama et al. Another study  reviewed that coronavirus is the most prominent example of a virus that has crossed the species barrier twice from wild animals to humans, SARS, and MERS and the possibility of crossing the species barrier for the third time cannot be ruled out in the case of SARS-CoV-2 (COVID-19). Ben et al.  reported that the bats are considered as the ancestral hosts in both SARS and MERS and also considered as the reservoir host of human coronaviruses like HCoV-229E and HCoV-NL63 (104). In the case of COVID-19, there are two possibilities for primary transmission; either it can be transmitted through intermediate hosts similar to that of SARS and MERS or directly from bats .
Singhal  reported that he most common symptoms associated with COVID-19 were fever, cough, dyspnea, expectoration, headache and myalgia or fatigue and individuals with asymptomatic infections were also suspected of potentially transmitting infections, which further add to the complexity of disease transmission dynamics in COVID-19 infection. He also reported that the cold- or flu-like symptoms usually set in from 2-4 days after a coronavirus infection and are typically mild. However, symptoms vary from person-to-person, and some forms of the virus can be fatal. The main symptoms of corona viruses include: 1. Sneezing 2. Runny nose 3. Cough 4. Watery diarrhea 5. Fever in rare cases 6. Sore throat and 7. Exacerbated asthma
GENERAL PREVENTIVE MEASURES
WHO  reported that the corona viruses can mutate effectively, which makes them so contagious? To prevent transmission, people should stay at home and rest while symptoms are active. Prevention is, so far, the best practice in order to reduce the impact of COVID-19 considering the lack of effective treatment . Ginnaro et al.  suggested that at the moment, there is no vaccine available and the best prevention is to avoid exposure to the virus. In order to achieve this goal, the main measures are the following: (1) to use face masks; (2) to cover coughs and sneezes with tissues; (3) to wash hands regularly with soap or disinfection with hand sanitizer containing at least 60% alcohol; (4) to avoid contact with infected people; (5) to maintain an appropriate distance from people; and (6) to refrain from touching eyes, nose and mouth with unwashed hands. (7) Maintain at least 1 m (3 feet) distance between yourself and anyone who is coughing or sneezing.
IMMUNE BOOSTER AYUSH KADHA
Drink herbal tea/decoction (Kadha) made from Tulsi (Basil), Dalchini (Cinnamon), Kalimirch (Black pepper), Shunthi (Dry Ginger) and Munakka (Raisin) - once or twice a day. Add jaggery (natural sugar) and/or fresh lemon juice to your taste, if needed.
Beside this Ministry of AYUSH also recommends the following self-care guidelines for preventive health measures. These are as follows:
1. Drink Golden Milk- Half tea spoon Haldi (turmeric) powder in 150 ml hot milk - once or twice a day.
2. Drink warm water throughout the day.
3. Daily practice of Yogasana, Pranayama and meditation for at least 30 min.
4. Spices like Haldi (Turmeric), Jeera (Cumin), Dhaniya (Coriander) and Lahsun (Garlic) are recommended in cooking.
5. Take Chyavanprash 10g (1tsf) in the morning. Diabetics should take sugar free.
TREATMENT BY PLASMA THERAPY
Rojas et al.  reported that the clinical administration of the blood plasma from recovered covid-19 patients to those severely affected by the disease could be a safe option without adverse effects, according to a study which may lead to better treatment protocols against novel corona virus infection. Salaza et al.  reported in his research article that on March 28, researchers from the Houston Methodist Hospital in the US, began clinical trials to transfuse plasma from recovered covid-19 patients into critically ill patients and they noted that 19 out of 25 patients improving with the treatment and 11 discharged from the hospital.
ROLE OF ANTIBODY AGAINST CORONA VIRUSES INFECTIONS
Murin et al.  reported that the antibody response in vivo is a dynamic and complex mixture of monoclonal antibodies (mAbs), which work together to target different antigenic domains on the envelope glycoprotein of the virus. He also suggested that it is very important to determine whether the antibodies are powerful in the adaptive immune responses to MERS‐CoV infection. Ansar and Ghosh  described more than 20 kinds of monoclonal antibodies, most of which are human or humanized antibodies. Solerti et al.  reported that the virus uses its spike proteins as an adhesion factor to facilitate host entry through a special receptor called dipeptidyl peptidase‐4 (DPP4) and this receptor is considered a key factor in the signal transmission and activation of acquired and innate immune responses in infected patients. Geng et al.  reported that the Human monoclonal antibody (m336) isolated from the phage display library interacts with the receptor‐binding region of MES coronavirus spike protein and displays strong neutralization activity to MES‐CoVin vitro m336 reduces the RNA titer of lung by 40,000 to 90 000 folds. He has also reported HMab m336 is found to significantly reduce the viral RNA titers and viral‐associated pathological changes in rabbit lung tissue. Ishii et al.  reported that mice inoculated with S nanoparticles produced high‐level neutralizing antibodies against homologous viruses, and these antibodies have no cross‐protection with heteroviruses. After being stimulated by SARS‐CoV, immunized ferrets produced more rapid and stronger neutralizing antibody reaction than the control animals; however, the strong inflammatory reaction is observed in liver tissue. The prolongation of IgG production may indicate the significance of IgG in both humoral immune response to acute SARS‐CoV infection and clearance of the remaining virus sources during recovery .
CASES OF COVID-19 IN INDIA
India reported the first confirmed case of the coronavirus infection on 30th January, 2020 in the state of Kerala. The affected had a travel history from Wuhan, China. In less than six months, the COVID-19 outbreak in India has spread to all states and union territories, infecting more than 11.2 lakh people. The curve is not flattening as the number of active cases has still increasing, and more than 27.5 thousand people have died because of the virus infection till July 20th, 2020.
This study shows a holistic picture of the current research in response to the outbreak of COVID-19. Studies in this domain are urgently needed to minimize the impact of the outbreak. Over the past 50 years the emergence of many different corona viruses that cause a wide variety of human and veterinary diseases has occurred. It is likely that these viruses will continue to emerge and to evolve and cause both human and veterinary outbreaks owing to their ability to recombine, mutate, and infect multiple species and cell types. Future research on corona viruses will continue to investigate many aspects of viral replication and pathogenesis.
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