Confirmed cases of swine flu have risen to 26 in the US state of Texas, including a toddler from Mexico City who died on Monday from the disease in a Houston hospital, health authorities said on Thursday.

According to data released on Thursday by the US Centers for Disease Control and Prevention (CDC), Texas, which borders Mexico where the virus was believed to have caused more than 159 deaths and many more illnesses, currently has the second most swine flu cases in the United States, following New York City, which has 50 cases.

The total number of confirmed swine flu cases in the nation rose to 109 on Thursday, with cases reported in Arizona, California, Indiana, Kansas, Massachusetts, Michigan, Nevada, New York City, Ohio, South Carolina and Texas.

Texas Governor Rick Perry issued a disaster declaration for the entire state on Wednesday, after the death of the 23-month-old Mexican toddler, the first human swine flu fatality in the United States and also the first outside of Mexico.

The disaster declaration "will move Texas to higher state of alert and release resources to address the spread of the virus," said Perry.

The governor said the CDC has approved his request for more anti-viral medication from the state's allotment in the national stockpile, making about 1.7 million doses available to Texas.

More Texas schools were being closed on Wednesday and Thursday after new cases of swine flu were confirmed in students on their campus. Special Olympics Texas also reportedly canceled its spring games across the state amid concerns about swine flu.