The number of people with measles in Texas increased to 146 in an outbreak that led this week to the death of an unvaccinated school-aged child, health officials said Friday. The number of cases — Texas’ largest in nearly 30 years — increased by 22 since Tuesday.

Declining vaccination rates, decreasing trust in government and a political unwillingness to endorse vaccines is shaping Texas’ measles response.

The Houston Health Department is hosting a free vaccination clinic on Saturday amid a measles outbreak in northwest Texas. The clinic will offer the measles, mumps and rubella vaccine to eligible children and adults from 10 a.