There are different vaccines that fight different diseases to provide immunization. To prevent measles, chicken pox, and yellow fever, live attenuated vaccines use weakened versions of the disease-causing pathogen. For hepatitis B, whooping cough, and shingles, subunit, recombinant, polysaccharide, and conjugate vaccines target specific parts of the pathogen. Diphtheria and tetanus are prevented by toxoid vaccines, which contain a toxin produced by the pathogen. To protect against the flu, polio, and rabies, inactivated vaccines use a killed form of the pathogen. In order to protect children from diseases, more and more vaccines are being developed. Staying up-to-date on immunization requirements can be challenging, but parents can access the Centers for Disease Control and Prevention (CDC) immunization schedule.