HOUSTON — Houston is one of 14 so-called "hot spots" around the U.S. where there's a delay or refusal to vaccinate, according to a study published at the Public Library of Science.

This is because a Texas law allows "conscientious exemption."

Fort Worth, Plano and Austin are also on the list.

This means that Texas parents don't have to have a medical or religious reason to stop their kids from getting vaccinated.

Anti-vaccine 'hotspots'
Anti-vaccine 'hotspots' according to PLOS
KVUE

RELATED (PDF): Exemption numbers by school district 2017-2018

According to the Texas Department of State Health Services, the number of parents requesting that vaccine exemption went up 19 percent in 2018.

The number of exempt students in area schools is still low, but private schools seem to have higher rates.

RELATED: Patients in Northwest measles outbreak traveled to Hawaii

RELATED: Measles outbreak fuels debate over refusing vaccinations