Pentavalent vaccine usually requires four shots, including three basic shots and one booster shot. The Pentavalent vaccine is a polio vaccine and Haemophilus influenzae type b (Hib) vaccine added to the DPT vaccine. The injection of this vaccine can simultaneously prevent diseases caused by infections of pertussis bacillus, diphtheria bacillus, tetanus bacillus, poliovirus and haemophilus influenzae type b. It is a mixture of bacterial and viral vaccines. The basic injection of the Pentavalent vaccine is usually given at 2, 3, or 4 months of age or at 3, 4, or 5 months of age, followed by a booster injection at one and a half years of age, for a total of four injections. After the DPT vaccination, there is a possibility of transient fever and other discomforts, as well as certain contraindications, so it is necessary to consult the doctor at the vaccination center before vaccination.