The weather changes rapidly in autumn, and the temperature difference  between morning and evening is large. If the human body fails to adapt to the  change in the short term, it is easy to cause a viral cold. Especially when the  working environment is not well ventilated, the cold is more likely to spread  quickly from person to person. Therefore, autumn is the season of high incidence  of colds. What should we do if we catch a cold in autumn? Upper respiratory  tract infection is commonly known as cold, which is a general term for acute  inflammation of the nasal cavity, pharynx, or throat. It is mainly transmitted  through virus-containing droplets, hands or utensils. People of various ages,  genders, occupations and regions may get colds. Certain kinds of colds are  infectious and can sometimes cause serious complications. Cold can occur  throughout the year, but it occurs more frequently in alternating period of  autumn, winter and spring. What are the preventive measures for colds? 1. Avoid  incentives. You should avoid coldness, rain, excessive fatigue. It is advised to  wash your hands frequently to avoid contact with mouth, eyes, and nose with  dirty hands. You should wear a mask when upper respiratory tract infections are  prevalent. It is necessary to avoid contact with cold patients, avoid crowded  public places and avoid entering and leaving public places, and pay attention to  indoor air circulation. Elderly and vulnerable people should pay more attention  to protection, such as adding clothes in time when the temperature difference  between morning and evening is large. 2. Enhance physical fitness. It is  suggested to adhere to moderate and regular outdoor exercises to improve the  body's immunity and cold tolerance, which are the main methods to prevent cold.  You should also pay attention to ensuring regular work and rest, and keeping a  balanced diet. 3. Immunomodulatory drugs and vaccines. For patients with  frequent and repeated occurrence of cold and elderly patients with low immunity,  immune enhancers can be used properly. Those with indications can be injected  with multivalent respiratory tract vaccines.