LONDON — Two months after a horse meat scandal first gripped Europe, tests conducted by European Union countries showed on Tuesday that France had found the most beef products containing horse DNA, while Britain had detected the most traces of a painkiller banned from the human food chain.

Results from more than 7,000 tests carried out by the 27 countries in the union found horse DNA in about 5 percent of samples, while phenylbutazone, the banned drug used as an equine painkiller, was discovered in about 0.5 percent of samples.

The figures, published by the European Commission, gave the first detailed picture of the extent of the problem.

Tonio Borg, the European commissioner for health and consumer policy, said the findings showed that it was “a matter of food fraud and not of food safety.”