![]() Others develop severe breathing problems and need to spend time in the hospital. Many people with COVID-19 experience a relatively mild form of the disease that does not require specialist treatment. Scientists are still investigating its source and initial pattern of spreading. Overall, however, there is little conclusive information about the origins of the virus. Some of the first people with COVID-19 had links to a live animal and seafood market. Many researchers believe SARS-CoV-2 first infected bats before spreading to other animals, including humans. The mortality rate varies from country to country. The new coronavirus has been responsible for millions of infections globally, and it has caused more than 2 million deaths. The virus spread rapidly around the world, and the World Health Organization (WHO) declared a pandemic in March 2020. ![]() They first identified the virus in Wuhan, China. ![]() Late in 2019, scientists started monitoring the outbreak of a new coronavirus, SARS-CoV-2, which causes COVID-19. Specifically, we focus on three dangerous diseases caused by coronaviruses: COVID-19, SARS, and MERS. This article looks at a few coronaviruses that can infect humans, the illnesses they cause, and how they transmit. Scientists call these human coronaviruses, or “HCoVs.” Sometimes, however, a virus mutates in a way that allows it to infect humans. Many coronaviruses are present in animals but do not affect humans. Others can cause severe acute respiratory syndrome ( SARS) or Middle East respiratory syndrome ( MERS), which can be life threatening. Some cause mild illnesses, such as the common cold. ![]() Experts named the newly identified virus severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and the illness that it causes coronavirus disease 19 ( COVID-19). They typically affect the respiratory tract, but their effects can extend well beyond the respiratory system.Īt the end of 2019, scientists identified a coronavirus outbreak in China. Send us feedback.Coronaviruses cause a range of illnesses, including COVID-19. These example sentences are selected automatically from various online news sources to reflect current usage of the word 'corona.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Grayson Quay, The Week, 1 July 2022 The corona can reach a million degrees Celsius (1.8 million degrees Fahrenheit), while the surface is 5,000 degrees Celsius (9,000 degrees Fahrenheit).Īshley Strickland, CNN, These include: corona, glory, green flashes, parhelia, Bishop’s Ring, and rainbows. 2021 Solar physicists are still puzzled over how the corona hangs onto this amount of heat.īruce Dorminey, Forbes, 2 July 2022 Technically, this term referred not to one specific virus, but to the subfamily Orthocoronavirinae, which is distinguished by its members' resemblance to a solar corona. 2022 For the first time in history a spacecraft flew through the Sun’s outer atmosphere, the corona. 2022 Through this surface mass ejection, Betelgeuse offloaded 400 billion times as much mass as the sun does during a typical coronal mass ejection, a regular event in which the sun casts off part of its outer atmosphere, called the corona. 2022 As a bonus a strong Solar Cycle 25 could mean a particularly spiky-looking solar corona around solar maximum. Recent Examples on the Web Our sun regularly experiences coronal mass ejections in which the star releases parts of its outer atmosphere, known as the corona.Īshley Strickland, CNN, 12 Aug.
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