It is normal to go a long time without catching a cold. Colds have a lot to do with an individual’s immune system, and not catching a cold for a long period of time indicates that the body has a strong resistance. Colds are upper respiratory tract infections caused by viruses. On average, adults will have 2 to 4 colds per year. If our own immunity and the body’s resistance is relatively strong, when we encounter bacteria, fungi, viruses and other pathogens invading the mucous membranes of the upper respiratory tract, we can block and engulf the pathogens, and we are less likely to experience cold symptoms. Some people are worried that a long period of time without a cold will cause a serious illness, in fact, only usually we need to pay attention to balanced nutrition, strengthen the exercise and avoid staying up late and other bad habits, enhance immunity and resistance, a long period of time without a cold is normal.