Immunoglobulin injections are currently available in the market, usually at 300-600 RMB a piece, one is 2.5 g. The usage and dosage are different for different diseases, and the cost of treatment is also inconsistent. For primary immunodeficiency diseases, the dosage is 400mg/d per kg of body weight, and for severe infections the dosage is 200-300mg/d per kg of body weight. 2-3 days are usually required. For patients with Kawasaki disease, a one-time injection dosage of 2g per kg of body weight is required, which means that it costs around 5,000 yuan per day to treat an important infection. So, it is more expensive and this drug is not covered by the medical insurance, so you must pay more attention to it.