THE ACCELERATING PACE of new vaccine development has made incorporating these agents into the childhood immunization schedule a major challenge. In 1989, it took 8 injections to immunize children from birth to 16 years of age; in 1998, the number has nearly doubled: 14 injections are required.
Nor is the pace slackening. In the next few years, vaccines to prevent infection with Streptococcus pneumoniae, Neisseria meningitidis in infants, respiratory syncytial virus, and Lyme disease (JAMA. 1998;279:1937-1938) are likely to be licensed.
Marwick C. Vaccinologists Aiming at Less Hurtful "Shots". JAMA. 1998;280(4):313. doi:10.1001/jama.280.4.313-JMN0722-3-1