A French monitoring programme for determining ochratoxin A occurrence in pig kidneys.

Ochratoxin A is a carcinogen and nephrotoxin which can enter the food chain resulting in human exposure. As pig herds are exposed to ochratoxin A through their feed, their kidneys, livers and pork meat are considered as a possible route of exposure for humans. France, an important producer of pork and pork products, set up a national monitoring programme which included the training of six routine public laboratories in the analysis of ochratoxin A using an immunoaffinity step followed by a HPLC-fluorimetric detection. The programme randomly sampled 300 healthy and 100 nephropathic pig kidneys in 1997 and 710 healthy pig kidneys in 1998. Less than 10% of samples were significantly contaminated by ochratoxin A : in the 1997 survey, 1% of samples contained 0.40-1.40 microg kg(-1) of ochratoxin A and in the 1998 survey 7.6 % exhibited ochratoxin A levels in the range 0.5-5 microg kg(-1). In the case of nephropathic kidneys, only traces of ochratoxin A (0.16 to 0.48 microg kg(-1)) were detected in six samples out of 100. Even if not a major route of exposure for humans, pigs are clearly exposed to this mycotoxin and monitoring of pork products and of feed for swine is necessary.