The World Health Organisation (WHO) yesterday released figures showing that confirmed cases of swine flu have reached 70,893 worldwide, with 311 deaths recorded from the A(H1N1) virus. The number of confirmed cases surged by more than 11,000 since WHO's last bulletin on Friday, and deaths rose by 48 over the same period. The USA accounted for more than half of the new cases, and 21 deaths. The US Center for Disease Control and Prevention used computer modelling and community surveys to estimate that about 1 million people in the country had swine flu, about 50 times more than official figures due to cases not being reported. Swine flu cases in Australia also jumped significantly, with 758 new cases and four deaths recorded. The total infection rate is now 4,038 confirmed cases and seven deaths.