A sharp increase in swine flu cases in Australia may mean the infection has become a pandemic, the World Health Organization says. For that to happen, officials would have to verify that the disease had become established outside North America, where the crisis began. "Once I get indisputable evidence, I will make the announcement," said WHO director general, Margaret Chan. More than 1,200 people have contracted the virus in Australia - none fatally. The total means Australia has seen a four-fold increase in a week. Less than a month ago the country had only a handful of cases of the...