Where does the coronavirus come from

　　Coronaviruses that infect humans were first isolated by scientists in the 1960s. They were named "coronaviruses" because of the corona structure that can be observed under the electron microscope. This new coronavirus, WHO recently called it "2019-nCoV" in the relevant announcement, meaning "2019 new coronavirus".

　　Finding the origin of the virus is essential for epidemic prevention and control. At present, the source of infection of the new coronavirus has not been found, and the transmission route of the epidemic has not been fully grasped. However, existing studies have shown that coronaviruses are common in animals such as bats and camels, and the virus mutates to humans only in rare cases.

　　Coronavirus is not only one of the main pathogens of common cold, but also the culprit of several severe epidemics.

　　According to the US Centers for Disease Control and Prevention, there are seven known coronaviruses that can infect humans, including new coronaviruses.

　　According to the WHO, the symptoms of people infected with coronavirus vary from virus to virus. Common signs include respiratory symptoms, fever, cough, shortness of breath, and difficulty breathing. In more serious cases, pneumonia, severe acute respiratory syndrome, renal failure, and even death can occur.

　　At present, there is no specific treatment for the diseases caused by the new coronavirus, and no vaccine is available; but many symptoms can be treated, so it needs to be treated according to the clinical situation of the patient. In addition, auxiliary care for infected persons may be very effective.