Is there any effect of vaccination for flu. Yes, it does. The reason is that vaccinations are usually given only when the child is healthy and does not have any abnormal reactions. Because the vaccination is an attenuated or inactivated vaccine, it is usually possible for a normal child to have a reaction to the vaccine, such as fever, diarrhea, cough or even an allergic reaction. If your child has a cold, he or she should not get the vaccination, especially if it is accompanied by fever, cough and runny nose. At this time, it means that the child’s immunity is low and resistance is low, and after vaccination, it is easy to cause aggravation of the original disease or cause new infection, which may lead to aggravation of cough, high fever and even convulsion. Therefore, vaccination should not be given when you have a cold, and active treatment is usually required. The vaccination can only be given when there is no abnormal reaction, cough, fever or runny nose after 1 week of stopping the medicine for the cold.