samples

Onion and environmental samples from McDonald's stores and distribution centres have been collected by the FDA, the Colorado Department of Agriculture, and the Colorado Department of Public Health and Environment.

The federal agency said that tests on the samples were ongoing, adding that it had completed onsite inspections at an onion grower in the state of Washington and at a Taylor Farms processing centre in Colorado.

The fast food giant resumed sales of the burger in all of its restaurants in America after it said samples of its beef patties, taken by the Colorado Department of Agriculture, tested negative for the bacteria.

Ms Nash is now gathering DNA samples from the relatives of the other 300 missing soldiers, in the hope she can give more families the same peace and joy she has brought Cameron, Tabby and Michael.

As designed, the review board found, the mission would probably cost up to $11 billion and not return samples to Earth until at least 2040.