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More than 100 students at St. Francis Preparatory School in Queens, New York, have fallen ill recently. Some have tested positive for swine flu, health authorities say.

At least 50 people in the United States have contracted the virus, officials say. Some of those who tested positive at the New York high school recently went to Cancun, Mexico, for spring break.

By Tuesday, the number of deaths believed attributable to swine flu climbed to as many as 152 -- all of them in Mexico. (Twenty-six cases, including seven deaths, have been confirmed in the country.)

St. Francis student Arianna Anastos, 16, wasn't on that spring break trip to Mexico, but her friends were. She started exhibiting flulike symptoms and was hospitalized last weekend.

CNN's Anderson Cooper spoke Monday night with the teen and her father, Chris, on "AC 360°." Read full article »

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