The study had important limitations, including the small number of patients and the lack of a control group that was followed with standard therapy to compare benefits and side effects.

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It was small, relatively short, and had no control groups on other drug-regimes to compare with.

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In an ideal world, the way to test this would be to have a control group of children who did not receive the vaccine, and compare the rates of autism in both.

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In six cases, it was possible to compare the effect of the new methods with a control area, where levels of disorder and police resources were similar.

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"If we compare the situation in Tunisia to the rest of the region, particularly Libya and Algeria, it is pretty much under control, " he said, adding that state and foreign interests were not under any significant threat.

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