Respiratory diseases can be prevented by using medicines that can enhance the immunity of the respiratory tract. At present, you can choose some Chinese medicines, such as Yu Ping Feng, Astragalus, Cordyceps, Ganoderma lucidum, propolis, honey, royal jelly, snow lotus, Xiyangshen, as well as tonifying the middle-aged and benefiting the qi granules, and nourishing yin and clearing the lungs pills, and so on. These medicines can enhance the body’s immunity and can be effective in moisturizing and nourishing the lungs. You can also choose western medicines, such as levamisole, transfer factor, thymopeptide, pidomod, splenic aminopeptide, Skikon, sodium carboxymethyl starch, as well as immunoglobulin, probiotics, multivitamin trace element preparation, colostrum and so on can enhance the body’s immunity and improve the ability to resist pathogens. You can also choose some vaccines, such as influenza vaccine, bronchitis vaccine, pneumonia vaccine, etc., can play a role in preventing the occurrence of these diseases.