Chicago public schools to serve antibiotic-free chickens

Rogers said the school district's announcement demonstrates that antibiotic-free farming is "mainstream and affordable."

Public health researchers have estimated that about 70 percent of antibiotics produced annually in the United States are used on healthy animals to help them grow or increase their resistance to disease. The agriculture and drug industries say keeping animals healthy benefits the public, but others are worried that overuse of antibiotics risks creating drug-resistance bacteria.

"The safety mechanisms put in place by federal government agencies have been successful in allowing veterinarians and farmers to use antibiotics to keep animals healthy while protecting public health," says the Animal Health Institute. "Studies indicate that the presence of foodborne bacteria increases when the use of antibiotics that help suppress animal diseases decreases."

Rep. Louise Slaughter (D-N.Y.) has for several years been leading efforts in Congress to ban the use of seven classes of antibiotics critical for human health on healthy animals. Four senators — Dianne FeinsteinDianne Emiel FeinsteinJeh Johnson: Media focused on 'Access Hollywood' tape instead of Russian meddling ahead of election What’s genius for Obama is scandal when it comes to Trump Coalition presses Transportation Dept. for stricter oversight of driverless cars MORE (D-Calif.), Susan CollinsSusan Margaret CollinsCollins: 'Extremely disappointing' ObamaCare fix left out of spending deal Overnight Cybersecurity: Zuckerberg breaks silence on Cambridge Analytica | Senators grill DHS chief on election security | Omnibus to include election cyber funds | Bill would create 'bug bounty' for State GOP lawmakers blast Dems for opposing ObamaCare fix MORE (R-Maine), Jack ReedJohn (Jack) Francis ReedOvernight Defense: Senate sides with Trump on military role in Yemen | Dem vets push for new war authorization on Iraq anniversary | General says time isn't 'right' for space corps Senate sides with Trump on providing Saudi military support Overnight Defense: Trump unveils new sanctions against Russia | Key Republicans back VA chief amid controversy | Trump gives boost to military 'space force' MORE (D-R.I.) and Barbara BoxerBarbara Levy BoxerThe ‘bang for the buck’ theory fueling Trump’s infrastructure plan Kamala Harris endorses Gavin Newsom for California governor Dems face hard choice for State of the Union response MORE (D-Calif.) — introduced companion legislation in June.