Abstract:The immune function of the middle-aged and elderly groups is decreased, and they are easy to be infected with the virus, and once infected, they are easy to be turned into acute and critical patients with a high mortality rate. In addition, China’s aging population is becoming more and more serious, and the middle-aged and elderly population is a high incidence of all kinds of respiratory or cardiovascular system diseases. Most middle-aged and elderly people have more than one chronic disease at a time and nee… Show more
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