Greenpeace yesterday called on Mexico to adopt emergency measures to combat the first serious outbreak of genetic pollution in the centre of diversity of maize, located in several communities in the state of Oaxaca. Testing of maize varieties from 22 communities in the area have revealed genetic contamination in 15 of them: 13 samples showed up to 10% levels of contamination, in two others the contamination level is known to be even higher, but no details have been published yet. The contamination originates from genetically engineered (GE) maize grains imported from the United States to Mexico to be used for food.