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CHEM 181 (47)

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CHEM 181
David Harpp

ANTIBIOTIC RESIDUES pages 280283Antibiotic resistance is becoming a huge concernThe only defense is to be careful with the antibiotics but this is not always the caseVancomycin is the antibiotic of last resort and there are some reports of resistance to that The more an antibiotic is used the lower the likelihood that it will maintain its effectivenessAbout 11 million of the 13 million kg of antibiotics produced annually in North America are not destined for human use They are given to hogs poultry and cattle in most cases not to cure them of disease but to promote their growth o Since the late 1940s socalled subtherapeutic doses of antibiotics have been added to animal feed to prevent disease and to increase feed efficiencyo This may have to do with reducing the competition for nutrients by cutting down on the natural bacterial population in the animals guts Some people also thins the intestinal wall and increases nutrient absorptionBut this leads to the flourishing of antibioticresistant bacteria in animals and these bacteria can infect humans o Chickens begin to excrete antibioticresistant E coli in their feces just 36 hours after being given tetracyclinelaced feed These also show up in the feces of farmersThis means that bacteria that have never been exposed to an antibi
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