Star Telecom's Digital Network Alert (DNA) was introduced earlier this year.

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By comparison, the CDC's existing Health Alert Network sent messages to 25, 000 public health officials in 50 states.

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There are now tools that collect intelligence, identify previously unknown attack attempts, and alert network operators to successful intrusions, giving them the ability to track down and eradicate them.

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While he estimates it will be five years until such a product is on the market, Patwari says a network of wireless transceivers around a bed can measure breathing rates and alert someone if breathing stops without any tubes or wires connected to the patient.

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In the lawsuit, Mr Zimmerman's lawyers contend that the network maliciously edited a call he made to police in Sanford, Florida, to alert them to what he saw as suspicious behaviour by a man near his home.

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President Bill Clinton's proposed network would create an electronic surveillance system that would link doctors, hospitals and health officials to alert them of outbreaks, according to a statement.

CNN: By FRANK BUCKLEY/