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FORT WORTH -- The Tarrant County Public Health Department announced no new confirmed cases of measles on Thursday afternoon, meaning the number of confirmed cases remains at 15. Denton County also confirmed no new cases, holding its tally firm at five.

But health officials were cautious, expressing concern that the number could go up in the coming days.

"We're not out of the woods," said Dr. Russell Jones with Tarrant County. "I suspect it is possible we could have more cases."

Meanwhile, local school districts are stepping up due diligence ahead of next week's return to classes.

Azle ISD said its 10 campus nurses and teachers will be keeping an extra eye over the student body, specifically the roughly 70 students that aren't fully immunized.

"Our nurses know who they are, and we will be careful," said Tanya Anderson, a district spokeswoman.

Azle is one of the districts that is close to the Eagle Mountain Church in Newark.

At least 20 cases of the measles have been traced back to a church visitor who attended a service after returning from an overseas trip in July.

The majority of the cases involve children who are home schooled. But other nearby districts are also taking precautions, just in case.

Northwest ISD has been in contact with Denton County health officials. About three percent of its students, or 670 to 680 children and teens, aren't fully vaccinated, said the district.

Eagle Mountain-Saginaw ISD could only provide partial data, saying at about a quarter of its campuses, less than one percent of the students weren't fully vaccinated. That averages out to about 140 students, give or take.

Under state law, students must get immunizations that cover the measles, but parents can opt out for religious reasons.

E-mail tunger@wfaa.com

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