The first cost of health investment is

What the subject wants to ask is "What is one of the costs of health investment?" Vaccine. Vaccine is an effective disease prevention measure and one of the most cost-effective health investments. With the increase of age, the immune function of the elderly gradually declines, and cardiovascular and cerebrovascular diseases, respiratory diseases, metabolic diseases and tumors often exist, so the risk of infectious diseases is obviously increased. Once the elderly are infected, they are often seriously ill, which seriously affects the quality of life of the elderly.