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  1. www.who.int › health-topics › coronavirusCoronavirus disease (COVID-19) - World Health Organization (WHO)

    Coronavirus disease (COVID-19) is an infectious disease caused by the SARS-CoV-2 virus. Most people infected with the virus will experience mild to moderate respiratory illness and recover without requiring special treatment. However, some will become seriously ill and require medical attention.

    • Coronavirus Disease (Covid-19)

      COVID-19 is a disease caused by a virus. The most common...

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      The first issue of Volume 38, includesConsultation...

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      Preventing and mitigating transmission of COVID-19 at work :...

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  3. www.hopkinsmedicine.org › coronavirusWhat Is Coronavirus? | Johns Hopkins Medicine

    • How Does The Coronavirus Spread?
    • How Did The Coronavirus Start?
    • What Is The Incubation Period For Covid-19?

    As of now, researchers know that the coronavirus is spread through droplets and virus particles released into the air when an infected person breathes, talks, laughs, sings, coughs or sneezes. Larger droplets may fall to the ground in a few seconds, but tiny infectious particles can linger in the air and accumulate in indoor places, especially wher...

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    The first case of COVID-19 was reported Dec. 1, 2019, and the cause was a then-new coronavirus later named SARS-CoV-2. SARS-CoV-2 may have originated in an animal and changed (mutated) so it could cause illness in humans. In the past, several infectious disease outbreaks have been traced to viruses originating in birds, pigs, bats and other animals...

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    Symptoms show up in people within two to 14 days of exposure to the virus. A person infected with the coronavirus is contagious to others for up to two days before symptoms appear, and they remain contagious to others for 10 to 20 days, depending upon their immune system and the severity of their illness.

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  4. www.who.int › news-room › fact-sheetsCoronavirus disease (COVID-19) - World Health Organization (WHO)

    Aug 9, 2023 · COVID-19 is a disease caused by a virus. The most common symptoms are fever, chills, and sore throat, but there are a range of others. Most people make a full recovery without needing hospital treatment. People with severe symptoms should seek medical care as soon as possible.

  5. www.mayoclinic.org › diseases-conditions › coronavirusCoronavirus disease 2019 (COVID-19) - Symptoms and causes

    Mar 27, 2024 · Coronavirus disease 2019 (COVID-19) is an illness caused by the virus SARS-CoV-2. Learn more about the symptoms, risks and ways to protect yourself. This content does not have an English version.

  6. en.wikipedia.org › wiki › CoronavirusCoronavirus - Wikipedia

    Coronaviruses are a group of related RNA viruses that cause diseases in mammals and birds. In humans and birds, they cause respiratory tract infections that can range from mild to lethal.

  7. scienceexchange.caltech.edu › topics › covid-19-coronavirusWhat is the coronavirus? Virus science explained - Caltech...

    COVID-19 is caused by a novel coronavirus. What are viruses? Are viruses alive? Why does soap works against them?

  8. www.livescience.com › what-are-coronavirusesWhat is a coronavirus? | Live Science

    Mar 14, 2022 · What is a coronavirus? References. By Nicoletta Lanese. published 14 March 2022. Coronaviruses, including SARS-CoV-2, belong to a large family of viruses. (Image credit: Shutterstock) Jump to:...