The story

Confirmed cases of swine flu worldwide increased to 257 on Thursday, up significantly from the previous day's total of 147, the World Health Organization reported.

In the United States, the Centers for Disease Control and Prevention said it confirmed 109 cases of swine flu, or 2009 H1N1, in 11 states, an increase of 18 from its previous total.

The death toll climbed again Thursday, with Mexican officials announcing the number of confirmed deaths increased to 12. There has been one death in the United States attributed to swine flu. Read full article »

CNN's Karl Penhaul, Diana Magnay, Jake Perez, Saeed Ahmed, Umaro Djau and Nicole Saidi contributed to this report.

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