# SARS-CoV-2 pandemic overview

> Live situation record from CLSTR: https://clstr.news/situations/20261013-sars-cov-2-pandemic-overview
> Updated: 2026-10-13T16:31:11.000Z. Sources: 14. Developments: 2.

COVID-19 is a contagious disease caused by the SARS-CoV-2 coronavirus that initiated a global pandemic in January 2020. Symptoms, which typically appear within one to fourteen days of exposure, include fever, fatigue, cough, breathing difficulties, and loss of taste or smell.

While approximately one-third of infected individuals do not exhibit noticeable symptoms, those who do may experience a range of severity. Data indicates that 81% of symptomatic patients experience mild to moderate symptoms, 14% develop severe symptoms, such as hypoxia, and 5% face critical conditions such as respiratory failure, shock, or organ dysfunction. Older populations are at a higher risk for severe illness. Later information notes that some patients experience long-term effects known as ‘long COVID’, which can persist for months or years.

Transmission occurs through respiratory particles or contact with contaminated surfaces and mucous membranes. Risk is elevated in close proximity or indoors where airborne particles can remain suspended. Individuals may remain contagious for up to 20 days, even without showing symptoms. Testing for the virus is typically conducted using methods such as RT-PCR and RT-LAMP via nasopharyngeal swabs.

## Claims

- COVID-19 is caused by the SARS-CoV-2 coronavirus. (corroborated by 3 sources)
- The disease spread worldwide in January 2020, resulting in a pandemic. (corroborated by 3 sources)
- At least one-third of infected individuals do not develop noticeable symptoms. (corroborated by 3 sources)
- Among symptomatic patients, 81% experience mild to moderate symptoms, 14% experience severe symptoms, and 5% experience critical symptoms. (corroborated by 3 sources)
- Individuals can remain contagious for up to 20 days, including those without symptoms. (corroborated by 3 sources)

## Timeline

### 2026-10-13: COVID-19: Overview of SARS-CoV-2 pandemic and symptoms

COVID-19, caused by the SARS-CoV-2 virus, triggered a global pandemic in January 2020. Symptoms vary from mild to critical, and asymptomatic individuals can remain contagious for up to 20 days.

4 sources. https://clstr.news/cluster/covid-19-overview-and-impact-of-sars-cov-2

### 2026-10-09: COVID-19: Overview of SARS-CoV-2 symptoms and transmission

COVID-19, caused by the SARS-CoV-2 virus, is a contagious disease that became a pandemic in January 2020. Symptoms vary, with 81% of symptomatic patients experiencing mild to moderate illness.

10 sources. https://clstr.news/cluster/covid-19-pandemic-and-sars-cov-2-overview

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Cite as: SARS-CoV-2 pandemic overview. CLSTR, https://clstr.news/situations/20261013-sars-cov-2-pandemic-overview