Viral infections Fever is a common symptom of upper respiratory tract infections, usually caused by viruses such as adenovirus, influenza virus, rhinovirus, respiratory syncytial virus, . Coxsackie virus, etc. The fever of viral infection is often reduced with Chai Hu Oral Liquid, but of course, the specific medication needs to be decided according to the degree of fever. Because of the different viruses that cause upper respiratory infections, the clinical symptoms caused by them are also somewhat different. What we usually call influenza, influenza for short, is caused by the influenza virus, spread by the respiratory route, highly contagious, spread quickly, often in the winter and spring outbreak epidemic, patients often appear acute high fever, sore throat, headache, general muscle and joint pain, accompanied by mild runny nose, sneezing, nasal congestion and other respiratory card symptoms. If a patient develops a high fever, it is important to promptly use fever-reducing medications such as acetaminophen, ibuprofen, aminopyrine or lysergic acid.” The “cold” is usually caused by viruses such as rhinovirus, which initially manifests as sneezing, nasal congestion, and clear watery nose. In children, acute herpes pharyngitis is often caused by coxsackievirus A. Mild fever can be treated with some antiviral drugs, such as Shuanghuanglian Oral Liquid, Antiviral Oral Liquid, or Chaihu Oral Liquid. If accompanied by severe cough, oral cough syrup can also be taken. For specific medication and dosage, you should go to the hospital for an interview and use the medication under the guidance of the doctor. In conclusion, common upper respiratory tract infections are mild, have a short duration and are self-limiting. In contrast, influenza is often more serious, and in addition to symptomatic treatment, antiviral treatment such as oseltamivir should be taken in a timely manner to avoid prolongation of the disease, leading to serious complications. In daily life, we should pay attention to the prevention of influenza, first of all, we should avoid getting cold, rain and excessive fatigue; secondly, we should do appropriate outdoor exercises to enhance physical fitness and improve the immunity of the body.