Upper respiratory tract infection is the most common disease in humans, and the susceptibility varies from person to person. Typical symptoms include cough, sore throat, runny nose, nasal congestion, headache, low-grade fever and sneezing. However, these infections sometimes lead to death in elderly and immunocompromised people. The prevention and treatment of this disease has two directions: one is to wash hands frequently, to exercise regularly, etc.; the other is to use natural medicine for treatment, such as echinacea, astragalus, bee propolis and spirulina are all effective in curing respiratory infections natural medicine.