Could Monsanto's glyphosate-based herbicide Roundup be leading to the overgrowth of deadly bacteria in animals and humans consuming genetically-modified food contaminated with it? This question follows from a new study published in the journal Current Microbiology titled, "The Effect of Glyphosate on Potential Pathogens and Beneficial Members of Poultry Microbiota In Vitro," which found that the active ingredient in Monsanto's Roundup herbicide, known as glyphosate, negatively impacted the gastrointestinal bacteria of poultry in vitro. The researchers presented evidence that highly pathogenic bacteria resisted glyphosate, whereas beneficial bacteria were moderately to highly susceptible to it.
Some of the beneficial species that were found to be suppressed by glyphosate were Enterococcus faecalis, Enterococcus faecium, Bacillus badius, Bifidobacterium adolescentis and Lactobacillus spp. The pathogenic species which were found to resist glyphosate toxicity were Salmonella Entritidis, Salmonella Gallinarum, Salmonella Typhimurium, Clostridium perfringens and Clostridium botulinum. The researchers stated that "A reduction of beneficial bacteria in the gastrointestinal tract microbiota by ingestion of glyphosate could disturb the normal gut bacterial community." Even more alarming was their observation that the toxicity of glyphosate to the most prevalent beneficial species, Enterococcus, "could be a significant predisposing factor that is associated with the increase in Clostridia botulinum-mediated diseases by suppressing the antagonistic effect of these bacteria on clostridia." Clostridia are a class of anaerobic bacteria including some of the most dangerous known to man, such as C. tetani and C. botulinum, which produce tetanus and botulin toxin, respectively.
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