Human immunoglobulin is a passive immunotherapy that contains a large amount of antibodies within the immunoglobulin, which are infused to the recipient to bring about a temporary immune protection from a low to or no immune state very quickly. Because antibodies react with antigens, they can directly synthesize toxins and kill bacteria or viruses. Therefore, immunoglobulins are useful for the prevention of bacterial and viral infections. The half-life of immunoglobulin in the body is about 16-24 days, and it takes about 2 months for all of it to wear off, and the effect is gone. It is mainly used for the prevention of measles, and it turns out that there are some cases of infectious hepatitis, and if combined with antibiotics, it can improve the efficacy for certain serious bacterial and viral infections. It is mainly treated by intravenous infusion, generally per kilogram of body weight can be an infusion of 0.4mg, the cost of this drug is relatively large, is now 2.5mg a, is probably more than 500 yuan or so, if the adult male, a day may cost in the 5000 yuan or so.