It is common to see budding mothers taking their babies to get vaccinated in hospitals, both large and small. However, some mothers have reported that their babies have red and swollen arms after receiving the diphtheria vaccine, a situation that has caused concern for many mothers, so here is a careful introduction to the vaccine. What is the diphtheria vaccine? The diphtheria vaccine is not a vaccine to prevent one disease, it is a three-in-one vaccine for pertussis, diphtheria and tetanus, which is made from pertussis vaccine, refined diphtheria and tetanus toxoid, in the right proportion, and is a vaccine to prevent three diseases: pertussis, diphtheria and tetanus. How should I get the pertussis vaccine? The relevant law stipulates that newborns should receive the first dose of diphtheria vaccine 3 months after birth and 3 consecutive doses, with the minimum interval between each dose not less than 28 days. At the age of 1.5 to 2 years, another booster dose of DPT vaccine is given, and at the age of 7 years, a booster dose of refined diphtheria vaccine or refined diphtheria diphtheria vaccine is given. So it is important to have this vaccination between the age of 3 months and 6 or 7 years. So how effective is the vaccination of diphtheria vaccine? It has been proved by domestic and foreign practice for many years that the vaccine has good preventive effect on pertussis, diphtheria and tetanus. The best prevention effect for tetanus is that the antibody can be maintained for 10 years and the protection rate can be more than 95%. The prevention effect for diphtheria is also good, with antibodies lasting for more than 5 years. Pertussis is worse than the first two, but the protection rate can still reach about 80%, and the antibodies can be maintained for at least 2-3 years. What should I do if the vaccination site is red and swollen after taking the diphtheria vaccine? Since the vaccine contains some adsorbent, the baby may have local redness, pain and itching after vaccination, hard nodules or sterile abscesses at the injection site, slight fever in the whole body, and may also be tired and irritable. However, all these symptoms can disappear within 2 days to a few months from the injection. The slight redness and swelling of the inoculation site after the vaccination of your baby is a normal physiological reaction, so don’t worry too much. There is generally no need for treatment. If you are still worried or have a large hard knot, you can use the following methods to deal with it: apply a cold compress (cool towel wrapped in a clean plastic bag) at the beginning of the hard knot, and apply a hot compress after 48 hours, paying attention to the time and temperature, not to burn; drink more warm water and eat lightly; avoid getting water in the injection area to prevent infection. If the hard knot is larger than 5 cm, you should consult a doctor. Vaccination contraindications 1. Babies with allergies are advised not to be vaccinated because it is not clear whether they will be allergic to the vaccine, so they need to visit a regular hospital to determine whether they can be vaccinated according to the examination results. 2. Vaccination should be postponed if the baby is in acute attack of fever, acute disease or chronic disease. 3.Persons with family and personal history of convulsions, epilepsy and other progressive neurological diseases. 4. Those with acute diseases, serious chronic diseases, acute seizures of chronic diseases and fever. 5. Those who have severe reactions after the first vaccination.