RT Journal T1 MEasles—los angeles county, california, 1988 JF American Journal of Diseases of Children JO American Journal of Diseases of Children YR 1989 FD May 1 VO 143 IS 5 SP 525 OP 526 DO 10.1001/archpedi.1989.02150170023010 UL http://dx.doi.org/10.1001/archpedi.1989.02150170023010 AB A PROVISIONAL TOTAL of 513 confirmed cases of measles was reported from Los Angeles County during 1988. The Los Angeles County cases represent 17.5% of all (2933) cases reported for the United States during this period and an incidence rate of 6.4 cases/100,000 persons—a risk 5.3 times higher than that in the rest of the United States (1.2/100,000).Of 353 confirmed patients with known ages and onset from May 1 to December 31, 228 (64.6%) were less than 5 years of age. A total of 135 (38.2%) were less than 16 months of age (i.e., too young for routine vaccination), including 87 (24.6%) less than 12 months of age; 93 (26.3%) were 16 months to 4 years of age.Preventability status was known for 353 (99.4%) of the cases; 150 (42.5%) of these were preventable, and 203 (57.5%) were considered programmatically nonpreventable.The setting of transmission was known for