This document discusses vaccines as promising methods for disease prevention. It provides details on two vaccines for pertussis (whooping cough): DPT and DTaP. DPT contains whole cell pertussis, while DTaP contains less bioactive pertussis toxin. Both vaccines also protect against diphtheria and tetanus. DTaP has replaced DPT in many countries as it is considered safer. The document suggests vaccines can help prevent the spread of contagious diseases.