The HSE said it was involved in two separate strands of work - the investigation into the management of asbestos at the school and the other into research sampling.

BBC: Asbestos: More concerns over Cwmcarn High School future

The Research 2000 poll, which carries a sampling error of plus or minus 3.5 percentage points, also shows 6 percent remain undecided in Missouri.

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Some research suggests that the miscarriage rate following chorionic villus sampling may be as high as 2%, the researchers said, which, if true, would raise that toll closer to 600.

BBC: Down's test miscarriage warning