For the first day in several days, the number of confirmed measles cases in Tarrant and Denton counties did not rise.
As of Thursday, there are 15 confirmed cases in Tarrant County and five in Denton County.
The Tarrant County cases include nine children and six adults that range in age from 4 months to 44 years. All of the school-age children involved are home-schooled.
Three of the cases are still infectious and have been asked to stay at home.
The cases in Denton County range in age from 9 to 17 and are located in the Justin area. All five were not immunized for measles.
All of these cases are linked to a previously identified case in Tarrant County, someone who had traveled outside the United States to a country where measles is common.
Health leaders say that vaccination is the most effective way to prevent measles. Health officials are encouraging residents to check their vaccination records with their health care provider.
Measles is a highly contagious respiratory disease that is spread through the air by breathing, sneezing or coughing. The virus can live in the air or on infected surfaces for up to two hours.
It is so contagious that, if one person has it, 90 percent of the people close to that person who are not immune will contract it.
Measles symptoms typically appear in an infected person between eight to 14 days after being exposed.
A typical case of measles begins with a fever, cough, runny nose, red eyes, and sore throat. Three to five days after the start of symptoms, a red or reddish-brown rash appears around the person's face or hairline and spreads to the neck, trunk, arms, legs and feet. The person's fever may spike to more than 104 degrees Fahrenheit.
People are considered contagious from four days before to four days after the rash appears.