. 2012 May 1;8(5):560–568. doi: 10.4161/hv.19204

Table 2. Increase in vaccines over the 20th century In the US¹⁴.

Year	Number of Vaccines	Possible Number of Injections by 2 y of Age	Possible Number of Injections at a Single Visit
1900*	1	1	1
1960^†	5	8	2
1980^‡	7	5	2
2000^§	11	20	5

Notes: *In 1990, 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 three 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. Reproduced with permission from Pediatrics¹⁴, Copyright © 2002 by the AAP.

Table 2. Increase in vaccines over the 20th century In the US14.

Table 2. Increase in vaccines over the 20th century In the US¹⁴.