You should never take a vaccination when you have a fever. During the fever the body’s immunity will be disorganized phenomenon, this time the resistance is often weaker, the vaccination although are some inactivated viruses or bacteria, but still has a certain pathogenicity. If the immune system is relatively low, it may lead to the occurrence of disease, it is particularly dangerous, but also aggravate the symptoms of fever, but also aggravate the infection. The immunity is not normal during the fever, the vaccination is inactivated viruses or bacteria, in order to stimulate the body to produce normal antibodies, in the case of immune disorders, it is possible that the antibodies are not able to produce normally, it loses the effect of vaccination, so you can not take the vaccination during the fever, usually need to wait for the fever to recover two weeks after the vaccination is recommended. If the fever is prolonged, it is more scientific to find out the cause of the fever and carry out targeted treatment.