TABLE 1.

Number of Vaccines and Possible Number of Injections Over the Past 100 Years

YearNumber of VaccinesPossible Number of Injections by 2 Years of AgePossible Number of Injections at a Single Visit
1900*111
1960582
1980752
2000§11205
  • * In 1900, children received the smallpox vaccine.

  • In 1960, children received the smallpox, diphtheria, tetanus, whole-cell pertussis, and polio vaccines. The diphtheria, tetanus, and whole-cell pertussis vaccines were given in combination (DTP), and the polio vaccine (inactivated) was given as a series of 3 injections.

  • In 1980, children received the DTP, polio, and MMR vaccines. The DTP and MMR vaccines were given in combination and the polio vaccine (live, attenuated) was given by mouth.

  • § In 2000 children received the diphtheria-tetanus-acellular-pertussis, MMR, inactivated polio, Hib, varicella, conjugate pneumococcal, and hepatitis B vaccines.