What are the causes of respiratory infectious diseases in winter and spring?

Respiratory infectious diseases are so prone to occur in winter and spring, the main reasons are:

1. In winter and spring, due to the cold weather, the mucous membrane on the surface of the respiratory tract is stimulated by cold air, and its function is reduced. Bacteria and viruses in the air are easy to invade from the respiratory tract.

2. Abnormal climate change in winter and spring, especially in late autumn and early winter, when winter goes and spring comes, the temperature changes greatly, and the temperature difference is large in the early, middle and late days; The temperature difference between indoor and outdoor is also obvious. So people will catch a cold if they are not careful. When they catch a cold, their body's resistance will be reduced, and bacteria and viruses can easily invade the human body.

3. In winter and spring, people's outdoor activities are relatively reduced, and the time of indoor life is increased. In order to keep warm, the ventilation of windows is reduced accordingly, and germs and viruses are easy to produce, reproduce and spread. Especially in places with closed doors and windows and crowded people, when the air can't circulate, healthy people inhale droplets with germs and viruses, and the chances of infection are more.