COVID-19

COVID-19 is an infectious disease caused by SARS-CoV-2. It can affect the respiratory tract and other organ systems, with outcomes ranging from no symptoms to severe illness.

SARS-CoV-2: SARS-CoV-2 is the coronavirus that causes COVID-19. The virus infects cells and triggers the disease’s varied effects.
COVID-19 testing: COVID-19 testing detects SARS-CoV-2 infection or evidence of an immune response to it. Testing identifies infection and can guide care and precautions.
COVID-19 pandemic: The COVID-19 pandemic was the global spread of COVID-19 beginning in 2019. The outbreak expanded into a worldwide public-health emergency.
Post-COVID-19 condition: Post-COVID-19 condition is the World Health Organization’s term for health problems continuing or developing after SARS-CoV-2 infection. It captures persistent effects that can follow the acute disease.
Origins of SARS-CoV-2: The origins of SARS-CoV-2 concern the still-investigated pathway by which the virus first entered humans. The precise events behind the initial emergence remain unresolved.
Viral entry: Viral entry is the process by which a virus gains access to a host cell. SARS-CoV-2 uses cell-surface proteins to enter susceptible cells.
COVID-19 diagnosis: COVID-19 diagnosis is the clinical assessment of whether a person has the disease. Symptoms, exposure history, and test results inform clinical decisions.
Wuhan: Wuhan is a city in Hubei province, China, where the first recognized cluster of COVID-19 cases was reported. The earliest known outbreak was identified there in late 2019.
Excess mortality: Excess mortality is the number of deaths above the level expected under ordinary conditions. It helps measure the pandemic’s overall mortality beyond confirmed COVID-19 deaths.
Viral evolution: Viral evolution is the change in viral populations through mutation, selection, and other processes. SARS-CoV-2 variants can alter transmission, immunity, and disease patterns.

Linked from 17 pages