Vaccines are biological agents with complex components. Unlike ordinary drugs, vaccines produce a series of immune reactions when they enter the body. In fact, like all drugs, vaccine is a foreign substance to the human body after all. Most healthy people do not have any adverse reactions after vaccination, but only a very small number of people have adverse reactions after vaccination due to individual differences, and this is also the case with the diphtheria vaccine. A small number of people may have adverse reactions after receiving the vaccine. What are the possible adverse reactions to diphtheria vaccination? Our common adverse reactions are pain and tenderness at the injection site, which in most cases disappear on their own within 2-3 days, and transient febrile reactions, most of which are mild and usually last 1-2 days before resolving on their own; a few children may have a transient rash, which usually resolves on its own in no more than 2 days. Rare adverse reactions include: severe febrile reactions, allergy, etc. What should we do if an adverse reaction occurs? If a child has a fever of 37.1℃-3.5℃ (axillary temperature) after vaccination, strengthen observation, take proper rest, drink more water, and prevent secondary diseases; when the fever exceeds 3.5℃, or is below 38.5℃ and accompanied by other systemic symptoms, abnormal crying, etc., go to the hospital promptly; for local reactions with redness and swelling of less than 1.5 cm in diameter, no treatment is generally required; for redness and swelling of For local reactions with a diameter of 1.5 cm to 4-5 cm, a clean towel can be used to apply a cold compress first, and then a hot compress after 48 hours, several times a day for 10-15 minutes each time; for local reactions with a diameter of redness greater than 4-5 cm, prompt consultation should be made at the hospital. Although severe allergic reactions are rare, once they occur, the consequences are serious and must be rescued in time, otherwise there is a risk to life. Inoculation should be equipped with epinephrine injection and other drugs. When anaphylaxis occurs, immediately let the child lie flat, head down, keep quiet, pay attention to warmth, and send him to the hospital in time. In addition to some adverse reactions, we should also pay attention to the fact that when a baby is sick, has a fever, or has severe eczema, it is better to suspend vaccination with the DPT3 vaccine; babies with neurological disorders such as epilepsy, severe allergic diseases and a history of seizures should be prohibited from receiving the DPT3 vaccine. “DPT3 vaccine. Vaccination tips Babies should be observed in the hospital for 30 minutes after vaccination before leaving. Do not take a bath on the day after vaccination, do not play strenuous sports for two to three days, keep the skin of the injection site clean and do not let the baby scratch it. Do not eat irritating and allergy-prone food, drink more warm water and eat fruits and vegetables as appropriate. Observe the baby’s performance carefully, if there is a high fever, coma, convulsions and other abnormal reactions, you should take the baby to the doctor in time.