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They are characterized by their crown-like appearance when viewed under an electron microscope, which is due to the spike-like structures on their surface. Coronaviruses have a large genome made up of RNA, enabling them to undergo rapid mutations and adapt to different hosts. Some coronaviruses can cause respiratory diseases in humans, such as the common cold, while others have been associated with more severe illnesses, including Middle East Respiratory Syndrome (MERS) and Severe Acute Respiratory Syndrome (SARS). The family of viruses gained significant attention in late 2019 when a new coronavirus, named SARS-CoV-2, was identified as the cause of the coronavirus disease 2019 (COVID-19) pandemic. Coronaviruses infect a wide range of animals, including mammals and birds. They can be transmitted between species, leading to outbreaks in domestic animals such as pigs and poultry. Bats are considered the natural reservoir for many coronaviruses, which can then spill over to other animals and eventually infect humans. The transmission between species can occur through direct contact, respiratory droplets, or consumption of infected animals. Efforts to control and prevent the spread of coronaviruses involve implementing strict hygiene measures, developing vaccines, and conducting research to better understand their biology and transmission patterns. The Wikipedia page on Coronaviridae provides detailed information on the classification, structure, lifecycle, and the impact of various coronaviruses on both human and animal health.