The next goal with Guinea worm is to stop transmission of the parasitic disease in southern Sudan, which reported 2, 690 cases in 2009.

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Given the current state of knowledge of the biology of the disease, these epidemiologists argued, an elimination campaign could not guarantee to stop transmission, and thus keep the case-load down.

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Under the new rules, network service providers will also be required to "instantly stop the transmission of illegal information once it is spotted" by deleting the posts and saving the records "before reporting to supervisory authorities".

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The sensation of speed is nearly irresistible from a stop, and the transmission rewards good footwork with slick shifting.

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"These outbreaks have a tendency to stamp themselves out, if you will, if we can get in and ... stop the chain of transmission, " he said.

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The second approach uses ARVs to stop one very specific form of transmission: that between an infected mother and her child at birth, or during suckling.

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The infection hides in the intestine and lymph nodes and can survive in manure and pond water for a year or more, making transmission of the disease difficult to stop.

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As one hospital in the United States has had some trouble preventing transmission, experts question whether less-equipped nations will be able to stop the virus.

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