A historic measles outbreak in West Texas is just short of 200 cases, Texas state health officials said Friday, while the number of cases in neighboring New Mexico tripled to 30. Most of the cases across both states are in people younger than 18 and people who are unvaccinated or have an unknown vaccination status.

Nearly 230 measles cases have been identified in outbreaks in West Texas and a nearby New Mexico county. One hundred ninety-eight measles cases have been reported in the West Texas outbreak, the Texas Department of State Health Services said in an update Friday — 39 more confirmed cases since an update on Tuesday.

The measles outbreak in West Texas is nearing 200 cases, according to a Friday morning update from the state health department. Health officials said 198 cases have been identified since late January.