A child’s fever and cold after a week of immunoglobulin may be caused by a relatively low immune system. Globulin usually refers to immunoglobulin, and immunoglobulin is mainly for people with low immunity. Injection of immune globulin can mobilize the body passive immunity, and have a certain resistance to some diseases. For example, when bacteria and viruses invade the body, immunoglobulin has the effect of activating the immune function. Although immunoglobulin has the above mentioned functions, it does not mean that children will not have fever or cold after immunoglobulin injection. Everyone’s body is different. If a child’s resistance is low, he or she may still have a fever or cold, and should actively cooperate with the doctor for treatment to alleviate the symptoms. Children with fever and cold after a week of immunoglobulin injection may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or therapy.