The DTP vaccine is a combination of pertussis bacteria, diphtheria toxoid, and tetanus toxoid, which can prevent whooping cough, diphtheria, and tetanus simultaneously. The target group for the DTP vaccine is children aged 3 months to 7 years. The DTP vaccine requires three consecutive shots. Only after the three consecutive injections will sufficient antibodies be produced. However, these antibodies can only be maintained for a certain period of time and do not provide lifelong immunity. Many parents mistakenly think that once their child is vaccinated, they are invulnerable to all diseases, but this is an unscientific notion. The efficacy of vaccines is not 100%. The common basic vaccines currently used generally have an efficacy rate of over 80%, meaning that after vaccination, 80% of people will produce antibodies. However, since the antibody concentration of some vaccines can decrease significantly over time to a level that does not reach the immunity concentration, booster shots are necessary.