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Reported cases of swine flu in North Texas as of Friday afternoon.

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Brett Shipp reports at 6 p.m. Friday

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• LINK: WFAA Swine Flu Information Center
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More schools were closed on Friday, and after-school events and proms canceled, as Texas continued to fight the swine flu.

Two Wise County schools were the latest to close, while Plano ISD suspended most student travel.

About 172,000 students are affected by the closures; about 300 campuses remain shut.

The Centers for Disease Control and Prevention confirmed 28 cases of swine flu in Texas on Friday. The count includes a Mexico City boy who died in Houston but isn't in the county-by-county breakdown.

Seven cases have been confirmed in Dallas County, five in Tarrant County, one in Denton County and one in Collin, local health officials said.

There are 146 confirmed cases nationally.

The Texas Department of State Health Services reports that the two new cases confirmed on Friday are in Denton County and Harris County.

Slidell High School in Wise County plans to reopen May 11.

Chico Elementary is closing for the same time period but Chico middle and high schools will remain open.

Associated Press

Sharon Kimbrough talks on her cell phone wearing a face mask at the International terminal at Dallas/Fort Worth International Airport.

Students at both Slidell High School and Chico Elementary were diagnosed with Type A influenza, although it is not known if they have swine flu.

Plano ISD suspended all overnight student travel from May 1 through May 10.

On Thursday, a Wilson Middle School student tested positive for the swine flu virus. The school will be shut until May 11. This is the only confirmed case in the Plano ISD, Collin County health said.

Plano ISD has also suspended all inside and outside district student travel and field trips.

Campus-based activities, such as PTA events, concerts, shows and recitals can still take place.

Banquets for student organizations that are held on and off campus are allowed, the district said.

Associated Press

Thomas Hanford uses cleaner to disinfect lockers at Arlington Heights High School in Fort Worth.

School officials also said student absences related to swine flu will be excused. This includes students whose parents choose to keep their children home as a preventative measure. These students will receive an excused absence and will be allowed to make up their work.

Grand Prairie's annual Cinco de Mayo parade and festival, due to take place on Saturday, has been postponed until September 12 as a result of the threat of swine flu.