The number of confirmed swine flu cases across the globe kept rising Friday, but some signs of hope emerged in the battle against the worldwide outbreak.
Scientists are working to develop vaccines to confront the flu, and one Mexican politician cited evidence that the virus is "letting up."
The World Health Organization said Friday that the number of confirmed cases stood at 365 worldwide, including 141 in the United States and 156 in Mexico. Thirteen countries have confirmed cases, the organization said.
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