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SARS-CoV-2: A Piece of Bad News
Shatha F Abdullah1, Inas K Sharquie1
1University of Baghdad, College of Medicine, Department of Microbiology and Immunology, Baghdad, Iraq.
Abstract:
A shocking third species emerged from a family of coronaviruses (CoV) in late 2019 following viruses causing SARS (Severe Acute Respiratory Syndrome-CoV) in 2003 and MERS (Middle East Respiratory Syndrome-CoV) in 2012; it's a novel coronavirus now called severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2; formerly called 2019-nCoV). First emerging in China, it has spread rapidly across the globe, giving rise to significant social and economic costs and imposing severe strain on healthcare systems. Since many attempts to control viral spread has been futile, the only old practice of containment including city lockdown and social distancing are working to some extent. Unfortunately, specific antiviral drugs and vaccines remain unavailable yet. Many factors are encountered to play essential roles in viral pathogenesis. These include a broad viral-host range with high receptor binding affinity to various human tissues, viral adaptation to humans, a high percentage of asymptomatic but infected carriers, prolonged incubation, and viral shedding periods. There are also a wide variety of pulmonary and extrapul-monary tissue damage mechanisms including direct cell injury or immune-mediated damages involving the immune cells, upregulation of proinflammatory cytokines, and antibody dependent enhancement that can result in multi-organ failure. In this article, we summarise some evidence on the various steps in SARS-CoV-2 pathogenesis and immune evasion strategies to assess their contribution to our understanding of unresolved problems related to SARS-CoV-2 prevention, control, and treatment protocols.
Insights
A new coronavirus, SARS-CoV-2, emerged in 2019, causing a global pandemic. Understanding its pathogenesis and immune evasion is crucial for developing effective prevention and treatment strategies.
Area of Science:
- Virology
- Immunology
- Public Health
Background:
- The emergence of a novel coronavirus, SARS-CoV-2, in late 2019, marks the third significant coronavirus outbreak after SARS-CoV and MERS-CoV.
- The rapid global spread of SARS-CoV-2 has led to substantial socioeconomic burdens and overwhelmed healthcare systems worldwide.
- Current containment measures like lockdowns and social distancing show limited success, with no specific antiviral drugs or vaccines yet available.
Purpose of the Study:
- To summarize evidence on SARS-CoV-2 pathogenesis, including viral-host interactions and tissue damage mechanisms.
- To review SARS-CoV-2 immune evasion strategies and their role in disease progression.
- To assess how understanding these factors can inform prevention, control, and treatment protocols for SARS-CoV-2.
Main Methods:
- Review of existing scientific literature on SARS-CoV-2 pathogenesis.
- Analysis of viral factors contributing to disease, such as host range and receptor binding.
- Examination of immune responses and damage mechanisms, including cytokine storms and antibody-dependent enhancement.
Main Results:
- SARS-CoV-2 exhibits a broad host range, high receptor binding affinity, and efficient human adaptation.
- Key pathogenic factors include asymptomatic transmission, prolonged incubation, and viral shedding.
- Disease mechanisms involve direct cellular injury, immune-mediated damage, and potential multi-organ failure.
Conclusions:
- A comprehensive understanding of SARS-CoV-2 pathogenesis and immune evasion is essential for addressing current challenges.
- Further research into viral mechanisms and host responses is critical for developing effective interventions.
- This knowledge is vital for improving SARS-CoV-2 prevention, control, and treatment strategies.
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