BRITISH MEDICAL ASSOCIATION AGAINST MARKER GENES. “There should be a ban on the use of antibiotic resistance marker genes in GM food, as the risk to human health from antibiotic resistance developing in micro-organisms is one of the major public health threats that will be faced in the 21st century”
http://www.gmwatch.org/index.php/news/archive/2002/2930-crop-gene-could-weaken-medicines