It is transmitted through contaminated food, drinking water and faeces.
It is probable that it has an animal source, but whether it spreads from contaminated food or something else in the environment is unknown.
Even when firms such as Unilever manage to find a source of, say, non-modified soya to put in their products, it tends to get contaminated with genetically modified stuff since there is so much of it about.
The vast majority of cases come from contaminated food produce, although it is possible to spread from person to person.
It is contracted by breathing in small droplets of contaminated water.
The company says it is working to determine how the shell eggs are being contaminated.
Ouseburn Farm, formerly known as Byker Farm, was forced to close in 2002 when its land was found to be contaminated by the old Victorian lead works it is built on.
Instead, it is spread through contact with people who have it and through contaminated surfaces, objects, and mostly through food.
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But, it has now reportedly decided it is not economically viable to build on the site because the land is contaminated.
The caesium finds its way into tiny pores on the surface, and the only way to remove it effectively is to grind off the surface, a difficult procedure which can create contaminated dust.
It is now thought Beryl Hope, 70, who died in August 2011, was given contaminated products.
It attaches to well tubes like a regular filter or is placed in a trench to intercept the contaminated groundwater from a landfill.
He said that "means worrying about the way in which the drilling takes places, it means worrying about making sure the methane is captured rather than discharged to the air and it means making sure that none of the contaminated water gets into the ground water that sometimes can fill our water supplies".
Some patients born long after the contaminated batches were given have tested positive for the virus, yet scientists are unsure whether it is communicable between humans.
Water, which seeps through the landfill, is contaminated with tritium from broken signs and can pass into water ways, carrying the tritium with it.
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Google gives data for the share of the devices connecting to Google Play that have large screens, but this is global, may not be a good sample and is contaminated by poor reporting (for example, at least one Samsung device changed the screen size it reported after a software update).
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