The function of COVID-19 Human Immunoglobulin is to enhance the immunity of the human body, which can play a certain role in the treatment of bacterial infections as well as viral infections. Generally, bacterial infections or viral infections are more serious and require immunoglobulin injections, which help to boost the body’s immunity and increase resistance. Immunoglobulin injections are passive immunotherapy and may cause side effects such as allergies, swelling and pain at the injection site. After the injection of immunoglobulin, you should rest for a short period of time, do not overdo activities, and eat a light diet.