Covid 19 definition

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Understanding COVID-19: Definition and Key Characteristics

COVID-19: Definition and Origin

COVID-19, short for coronavirus disease 2019, is caused by the virus SARS-CoV-2 (severe acute respiratory syndrome coronavirus 2). The disease was first identified in Wuhan, China, in December 2019 and has since spread globally, leading to a pandemic Alberca2020Sun2020Wu2020. The World Health Organization (WHO) officially named the disease COVID-19 on February 11, 2020 Sun2020Wu2020.

Symptoms and Transmission

COVID-19 primarily affects the respiratory system, causing symptoms such as fever, cough, tiredness, and shortness of breath. In some cases, it can also cause diarrhea . The severity of symptoms can vary, with children and teenagers often experiencing milder symptoms, while the elderly and those with underlying health conditions are at higher risk of severe illness and death Alberca2020Mason2020. The virus spreads easily from person to person through respiratory droplets and contact with contaminated surfaces Alberca2020Wu2020.

Global Impact and Epidemiology

The COVID-19 pandemic has affected over 185 countries, with millions of confirmed cases and significant mortality . The virus's rapid spread has led to widespread public health measures, including lockdowns, social distancing, and travel restrictions, to control the outbreak Wu2020Harapan2020. The disease's zoonotic origin and potential for person-to-person transmission have made it a significant public health challenge .

Pathogenesis and Clinical Stages

COVID-19 can be understood through its impact on different parts of the respiratory system. Mild cases are typically confined to the upper airways, while severe cases involve the lower respiratory tract and can lead to pneumonia and acute respiratory distress syndrome (ARDS) . The virus enters cells via the angiotensin-converting enzyme 2 (ACE2) receptor, which is abundant in the lungs Clerkin2020Mason2020.

Post-Acute COVID-19 Syndrome

As the number of recovered COVID-19 patients grows, there is increasing recognition of post-acute COVID-19 syndrome. This condition is characterized by persistent symptoms and long-term complications that extend beyond the acute phase of the illness, often lasting more than four weeks from the onset of symptoms . These prolonged effects necessitate ongoing medical care and monitoring for survivors .

Conclusion

COVID-19, caused by the SARS-CoV-2 virus, is a highly transmissible and potentially severe respiratory disease that has led to a global pandemic. Understanding its symptoms, transmission, and long-term effects is crucial for managing and mitigating its impact on public health. Continued research and public health efforts are essential to control the spread and address the long-term health consequences of COVID-19.

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Most relevant research papers on this topic

What Is COVID-19?

COVID-19 is a pandemic caused by the SARS-CoV-2 virus, causing fever, cough, fatigue, shortness of breath, and sometimes diarrhea.

2020·

8482citations

·G. Alberca et al.

DOI

Understanding of COVID‐19 based on current evidence

Since December 2019, a series of unexplained pneumonia cases have been reported in Wuhan, China. On 12 January 2020, the World Health Organization (WHO) temporarily named this new virus as the 2019 novel coronavirus (2019‐nCoV). On 11 February 2020, the WHO officially named the disease caused by the 2019‐nCoV as coronavirus disease (COVID‐19). The COVID‐19 epidemic is spreading all over the world, especially in China. Based on the published evidence, we systematically discuss the characteristics of COVID‐19 in the hope of providing a reference for future studies and help for the prevention and control of the COVID‐19 epidemic.

2020·

978citations

·P. Sun et al.

Journal of Medical Virology·

DOI

The outbreak of COVID-19: An overview

COVID-19 is a potentially zoonotic disease with low to moderate mortality rates and no definite treatment, requiring prompt identification and prevention through travel or contact history.

Literature ReviewRigorous Journal

2020·

849citations

·Yi-Chi Wu et al.

Journal of the Chinese Medical Association : JCMA·

DOI

COVID-19 and Cardiovascular Disease

COVID-19 has a high prevalence of cardiovascular disease and poses challenges for heart transplantation, with promising therapies under investigation to treat and prevent the pandemic.

Literature ReviewRigorous Journal

2020·

1504citations

·K. Clerkin et al.

DOI

Pathogenesis of COVID-19 from a cell biologic perspective

COVID-19 can be divided into three phases based on the region of the lung infected, with mild disease confined to conducting airways and severe disease involving the gas exchange portion of the lung.

Rigorous Journal

2020·

745citations

·R. Mason

The European Respiratory Journal·

DOI

Post-acute COVID-19 syndrome

Post-acute COVID-19 syndrome, characterized by persistent symptoms and delayed complications, requires multidisciplinary care and a framework for identifying high-risk individuals in dedicated COVID-19 clinics.

Literature ReviewRigorous Journal

2021·

4122citations

·Ani Nalbandian et al.

Nature medicine·

DOI

Coronavirus disease 2019 (COVID-19): A literature review

COVID-19 is caused by a novel SARS-CoV-2, with a global outbreak and 1,381 deaths reported as of February 14, 2020.

Literature Review

2020·

1356citations

·H. Harapan et al.

Journal of Infection and Public Health·

DOI

The immune system and COVID-19: Friend or foe?

Abstract Aim Coronavirus disease 2019 (COVID-19) is a novel highly contagious infection caused by SARS-CoV-2, which has been became a global public health challenge. The pathogenesis of this virus is not yet clearly understood, but there is evidence of a hyper-inflammatory immune response in critically ill patients, which leads to acute respiratory distress syndrome (ARDS) and multi-organ failure. Material and methods A literature review was performed to identify relevant articles on COVID-19 published up to April 30, 2020. The search resulted in 361 total articles. After reviewing the titles and abstracts for inclusion, some irrelevant papers were excluded. Additional relevant articles were identified from a review of citations referenced. Key findings SARS-CoV-2, directly and indirectly, affects the immune system and avoids being eliminated in early stages. On the other hand, the secretion of inflammatory cytokines creates critical conditions that lead to multi-organ failure. Significance The immune system which is affected by the virus tries to respond via a cytokine storm and hyperinflammation, which itself leads to further multi-organ damage and even death.

Systematic Review

2020·

224citations

·F. Yazdanpanah et al.

Life Sciences·

DOI

COVID-19 Infection

COVID-19 patients may require intubation and critical care management, requiring understanding of coronavirus biology and acute respiratory distress syndrome pathophysiology for effective management.

Literature Review

2020·

252citations

·J. Greenland et al.

Anesthesiology·

DOI

Molecular immune pathogenesis and diagnosis of COVID-19

COVID-19's molecular immune pathogenesis and diagnosis are similar to those of SARS-CoV and MERS-CoV, offering potential therapeutic targets for combating SARS-CoV-2.

Literature Review

2020·

1533citations

·Xiaowei Li et al.

Journal of Pharmaceutical Analysis·

DOI

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