GENEVA — The World Health Organization told its member nations it was declaring a swine flu pandemic Thursday — the first global flu epidemic in 41 years — as infections climbed in the United States, Europe, Australia, South America and elsewhere. WHO spokesman Gregory Hartl stressed, however, that "Phase 6 doesn't mean anything concerning severity, it is concerning global spread. . . . Pandemic means global, but it doesn't have any connotation of severity or mildness." In fact...