Since the 21st century, there have been two outbreaks in China that have impressed the whole country, one was SARS in 2003, and the other was the new coronavirus, which caused the new coronary pneumonia. The two epidemics, in addition to the type of virus belong to the coronavirus, there is a common point is that everyone believes that they are infected with people because of the consumption of wild animals, so many people think that as long as they do not eat wild animals, the virus will not find humans. But this is not the case, viruses have always been around us. From ancient times to the present, viruses have never been absent Infectious diseases have always been the main killer of human beings. According to the “Timeline of Ancient Chinese Epidemics”, there were 352 major epidemics in China in the 2,154 years from 243 B.C. to 1911 A.D. On average, they occurred about once every six years, and the culprits of these infectious diseases were various viruses. The Black Death (bubonic plague), which spread across Asia and Europe in the 14th century, the unresolved cholera, and the influenza that brought World War I to a premature end, were all responsible for these epidemics, not just in China but abroad as well. In modern times, in addition to viruses that appeared suddenly like SARS and the new coronavirus, there are many other viruses that have always existed like Ebola, yellow fever virus, and influenza viruses that have seasonality. Before the development of modern medicine, we knew almost nothing about viruses, and the only way to fight them was basically isolation, and patients could only rely on their own immunity if they wanted to heal. In front of the virus, we have no power to fight. With the development of modern medicine, we know more and more about viruses and gradually have the ability to deal with them, such as serums, vaccines, antibiotics and so on. Among these treatments, we are most familiar with and use vaccines and antibiotics the most, and the vaccine’s most famous battle would be the eradication of the smallpox virus. Smallpox is a very old and deadly virus that dates back about 3,500 years. between 1400 and 1800 in Europe, about 500 million people died of smallpox every 100 years. It was not until the end of the 18th century that the British physician, Dr. Ginner, discovered that smallpox could not be obtained from cattle, and everyone began to prevent smallpox by “planting pox”, which was the prototype of the vaccine. Later, scientists discovered that smallpox was caused by a virus and had the ability to mass-produce vaccines, and the smallpox virus slowly disappeared from the human population. Three years after the last case of smallpox in the world was recorded in Ethiopia in 1977, on May 8, 1980, the World Health Organization officially announced that smallpox had been eradicated worldwide. This was the first virus to be eradicated from humans, but it is also the only virus to have been eradicated to date. The threat of the virus still exists Even though we have vaccines, antibiotics and many other means to deal with the virus, the threat it poses to us has not disappeared. Whether it is a vaccine or a serum, they can only be used against known viruses, and viruses are always mutating and evolving, and it is difficult for new drugs and vaccines to keep up with them; antibiotics and other inhibitory drugs cannot kill viruses, and they also produce side effects and cannot be used on a large scale to treat infectious diseases. So to date, the best way to combat viruses is still prevention through public health. Since the 21st century, public health issues have become one of the most important things in medicine. In 2007, the British Medical Journal conducted a worldwide survey to determine the discoveries and inventions that have made a significant contribution to human health since 1840, with antibiotics coming in second, vaccines in fourth, and hygiene in first place. British Medical Journal 2007 public survey results Thanks to the construction of modern civilization, personal health problems in most countries have made some progress, but in contrast, obesity and other public health problems have become increasingly serious, especially in China, the number of people suffering from diabetes has exceeded 100 million, or the world’s largest obese population, not only to our public health has brought a lot of pressure, but also To their own great risk, in this new crown pneumonia, obese and diabetic patients have a higher probability of infection and risk of infection than ordinary people. In fact, long before the emergence of Newcastle pneumonia, our country has been trying to solve the problem of obesity and diabetes, in addition to strengthening the first off science, the control of food safety for young people has become more strict. Meanwhile, an effective method of treating obesity and diabetes, weight loss metabolic surgery, is also developing rapidly, with more than 10,000 people receiving related surgeries in China in 2018 alone. In addition, following the “Chinese Guidelines for the Surgical Treatment of Obesity and Diabetes (2014)”, experts in bariatric metabolic surgery such as Wu Liangping of the Chinese Society of Physicians Surgical Branch jointly developed the “Chinese Guidelines for the Surgical Treatment of Obesity and Diabetes (2019)” edition based on years of research and clinical experience and released it last April, making bariatric metabolic surgery in China more regulated. For thousands of years, human beings have never stopped fighting with viruses. Although with the advancement of medical technology and public health, we are no longer so powerless in facing them, they can still pose a considerable threat to our health. So no matter what time of the year it is important that we practice preventive habits and maintain a healthy body so that viruses are less likely to come to us.