H1N1 swine flu has killed more than 700 people around the world since the outbreak began four months ago, says the World Health Organization (WHO).

This represents a jump of at least two-thirds from the last official death toll figure of 429, published by the WHO on July 6, the BBC reported.

Margaret Chan, WHO director-general, has warned that swine flu will become the biggest flu pandemic ever seen.

However, most cases continue to produce only mild symptoms. The overwhelming majority of patients usually recover, even without medical treatment, within a week of falling ill.

The WHO has said the pandemic is developing at such a high speed that it is now pointless to try to document every case.

In past pandemics, flu viruses have needed more than six months to spread as widely as the new H1N1 virus has spread in less than six weeks.

But officials have stressed that there is an ongoing need for all countries to monitor unusual events, such as clusters of severe or fatal cases, or unusual clinical patterns, closely.

Some 125 000 laboratory-confirmed cases have been reported worldwide - but the number of actual cases far exceeds that.

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