The temperature is high and low, which is easy to catch a cold, leading to tonsillitis, bronchitis and pneumonia; At this time, respiratory infectious diseases, such as diphtheria, scarlet fever, whooping cough, measles, chickenpox, epidemic meningitis and so on. , is a frequent occurrence. Therefore, we should pay close attention to the weather changes, increase or decrease clothes, go to public places as little as possible, and pay special attention to "illness from the mouth". I think the website of Sanjiu Yangshengtang has a topic of Qingming health preservation, which is quite good.