Kruger, who failed a routine pre-season test in Durban on 24 January, has been suspended from all rugby with immediate effect.

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But salmonella strains were found last week during routine test by Kraft Foods, one of about three dozen companies that purchase pistachios from Setton Farms, he said.

CNN: California plant recalls 1 million pounds of pistachio products

Mayo, which asks whether a routine medical test can be patented.

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