The discovery of horse DNA in hamburgers on sale at supermarkets in Ireland and Britain is testing the appetite of meat lovers there.

The Food Safety Authority of Ireland said Tuesday that 10 out of 27 hamburger products it analyzed in a study were found to contain horse DNA, and 23 of them tested positive for pig DNA.

The horse-tainted burgers, on sale at several different supermarket chains, came from two meat processing plants in Ireland and one in Britain, the Irish authority said.
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