Early childhood vaccination levels among urban children--Connecticut, 1990 and 1991.

In the United States, the high incidence of measles among urban preschool-aged children who had not received age-appropriate vaccination has focused attention on the adequacy of and barriers to early childhood vaccinations. To assess early childhood vaccination levels of urban Connecticut children, during fall 1990 and spring 1991, the Connecticut Department of Health Services conducted retrospective surveys of first-grade students in Hartford and New Haven, both with populations greater than 100,000 persons.