There is a conversation about antibiotics that almost never happens in a doctor's office. It's not about whether you should take them — it's about whether you're already taking them without knowing it, every time you sit down to eat.
You can't consent to what you've never been told.
The Scale of the Problem
In 2021, the FDA reported that approximately 10.4 million kilograms of medically important antimicrobials were sold for use in food animals in the United States. This number does not include drugs classified as non-medically important — compounds like ionophores, which are used exclusively in veterinary settings and have no human counterpart but still alter the biology of every animal that consumes them.
The rationale for agricultural antibiotic use falls into two broad categories: treatment of sick animals, and subtherapeutic dosing for growth promotion and disease prevention in healthy ones. The second category is where the vast majority of use has historically occurred. Animals in industrial confinement operations — crowded, stressed, often immune-compromised — are routinely given low-dose antibiotics because without them, infectious disease would spread through a facility quickly. The drugs keep the animals alive long enough to reach slaughter weight. They also, conveniently, accelerate weight gain. The mechanism for that growth promotion effect is the same one that concerns every informed practitioner: altered gut microbiome.
Which Antibiotics, Exactly
The drug classes used in livestock production read like a catalog of human medicine — the same antibiotics your doctor prescribes are given by the ton to animals you eat.
Tetracyclines Oxytetracycline, chlortetracycline, doxycycline — largest share of livestock use Human uses: acne, respiratory infections, Lyme disease
Macrolides Tylosin, erythromycin — cattle, poultry, swine Human equivalent: azithromycin (Z-Pack)
Beta-Lactams Penicillins used across species Human uses: most common antibiotic class in medicine
Fluoroquinolones Enrofloxacin — still used in other livestock sectors Human equivalent: ciprofloxacin (Cipro)
Sulfonamides Sulfamethoxazole — poultry, swine, cattle Human equivalent: Bactrim (trimethoprim-sulfa)
Colistin — Last Resort Still used in livestock in countries exporting to the US Human use: only when all else fails — too toxic for routine use
Ionophores — The Invisible Class
Monensin, salinomycin, lasalocid, and narasin are given to cattle and poultry for growth efficiency and parasite prevention. They are not used in human medicine — too toxic for that. The FDA classifies them as "non-medically important," which exempts them from tighter oversight. There is no mandatory withdrawal period before slaughter. They are not tracked under the same reporting systems. The full scale of their use is not publicly quantified. And they are biologically active inside every animal that consumes them.
It Isn't Just Meat
The assumption that antibiotic residues are a meat problem misses most of the exposure pathway. Dairy cattle receive antibiotics for mastitis — endemic in factory-farmed herds. Testing exists, but it doesn't cover every drug. Some veterinary antibiotics pass through undetected because they're not on the screening panel. Eggs present the same gap: birds treated during laying cycles, withdrawal periods not always followed.
Plant agriculture is the layer nobody talks about. Streptomycin — the antibiotic associated with tuberculosis treatment — is sprayed directly onto apple, pear, and stone fruit orchards to control fire blight. Oxytetracycline is also registered for crop use. Organic certification prohibits streptomycin on tree fruits, which makes this one of the clearest cases where the organic label represents a real, documented difference in your actual exposure.
Water: The Chronic Background Exposure
Antibiotic compounds excreted by animals and humans enter waterways through agricultural runoff and municipal wastewater — which is not designed to remove pharmaceuticals. US surface and groundwater consistently tests positive for tetracyclines, sulfonamides, fluoroquinolones, and macrolides. People drinking from wells near confined animal feeding operations carry a measurably higher antibiotic burden in their daily water supply.
What Residues Do in the Human Body
The regulatory framework is built on tolerance levels — the idea that a small amount is acceptable because it doesn't cause acute harm. That logic treats the gut as a transit system. It isn't.
The human gastrointestinal tract houses between 38 and 100 trillion microbial organisms that synthesize vitamins, regulate immune responses, produce neurotransmitter precursors, process bile acids, train the mucosal immune system, and maintain the barrier integrity of the gut lining. No pharmaceutical has ever replicated these functions. Disrupting this ecosystem at low levels, repeatedly, over years, is not neutral. It is simply an effect that takes longer to become visible.
70% of your immune system lives in or next to your gut. The gut-associated lymphoid tissue (GALT) is the largest component of the human immune system. What happens to the microbiome happens to immune surveillance, oral tolerance, and the calibration of inflammatory responses. The rise in autoimmune conditions and food sensitivities in industrialized nations tracks closely with the industrialization of food — including its antibiotic load.
Research published in Nature, Cell Host & Microbe, and Gut has documented that subtherapeutic antibiotic doses — the same doses used in livestock — alter microbiome composition in animals and humans alike. The changes favor resistant strains, reduce diversity, and shift the Firmicutes-to-Bacteroidetes ratio in ways that parallel obesity, metabolic syndrome, and inflammatory bowel conditions. A microbiome chronically exposed to low-dose antibiotics through food is not a neutral microbiome. It is a shaped one.
The Resistance Crisis
Antimicrobial resistance is now classified by the WHO as one of the ten greatest global public health threats. The CDC estimates 2.8 million resistant infections in the US annually, killing 35,000 people. Globally: 1.27 million deaths in 2019, projected to reach 10 million annually by 2050 if trajectories continue.
The mcr-1 gene, which confers resistance to colistin — a last-resort antibiotic — was first identified in livestock in China in 2015. Within months it was found in human clinical isolates in dozens of countries. Within two years it had reached the United States in both livestock and humans.
This is not a hypothetical risk. Colistin is one of the drugs physicians reach for when a patient has a carbapenem-resistant infection and almost nothing else will work. The fact that it was being used routinely in food production while resistance to it spread globally is a documented failure of the regulatory framework that was supposed to prevent exactly this.
Carbapenem-resistant Enterobacteriaceae — including resistant Klebsiella pneumoniae and E. coli — are now found in both animal and human populations. Resistance genes move between settings. The concept of One Health — the recognition that human, animal, and environmental health are inseparable — emerged from this reality. It remains mostly aspirational as policy.
Aquaculture: The Overlooked Vector
Farmed shrimp is one of the most antibiotic-contaminated foods consistently found in US retail grocery stores. Aquaculture receives far less scrutiny than land-animal operations, yet it is one of the fastest-growing food sectors in the world, and its antibiotic use is substantial and invisible to the consumer.
Farmed shrimp and fish in high-density enclosures are treated with tetracyclines, fluoroquinolones, and sulfonamides. Countries supplying significant US seafood imports — Vietnam, Thailand, India, Bangladesh, Ecuador — have far weaker regulatory frameworks than US domestic production. The FDA tests only a small fraction of imported seafood for drug residues, and the list of drugs tested does not cover all compounds in use.
A 2015 study in the Journal of Hazardous Materials found retail shrimp imported from Southeast Asia contained antibiotic residues — including chloramphenicol and nitrofurans, both banned from food use in the US — at levels that would not be permitted if the shrimp had been produced domestically. This finding has been replicated by multiple independent research groups.
The Regulatory Gap
In 2017, the FDA asked the pharmaceutical industry to voluntarily remove "growth promotion" claims from antibiotic labels. This was presented as a meaningful reform. In practice, it was the equivalent of asking tobacco companies to stop marketing cigarettes as slimming, without restricting the sale of cigarettes.
The same drugs, at the same doses, can still be administered under the label of "disease prevention." The distinction is paperwork, not pharmacology. A veterinarian's signature is now required — but in a system where a single accredited veterinarian may oversee hundreds of thousands of animals across multiple facilities, the oversight this implies is largely administrative.
There is no comprehensive mandatory residue testing program covering all approved veterinary drugs across all meat and poultry sold in the United States. Ionophores are not routinely tested for because they are classified as non-medically important — despite being biologically active compounds with no required withdrawal period before slaughter.
The informed consent framework that governs human medicine does not extend to the food supply. The antibiotic residues, the resistance genes on food surfaces, the ionophores in conventionally raised beef — none appear on any label. Nobody asks your permission. Nobody tells you. That's why the Action Guide tab exists.
Reducing Your Antibiotic Load
A practical hierarchy for what to change, in what order, and why — without overwhelm and without greenwashing.
If Budget Is Limited: Where to Start First
Not everyone can overhaul their entire food supply at once. If you're working with real budget constraints, here is the priority order that will reduce your exposure the most per dollar spent.
Shift your meat and poultry first.
Muscle tissue, fat, and organs carry the highest concentrations of residues. This is where subtherapeutic dosing lands most heavily. Even moving one category — say, chicken — to a verified label matters more than switching everything in the pantry to organic.
Change your seafood sourcing.
Farmed shrimp from Southeast Asia is one of the most antibiotic-contaminated foods consistently found in retail grocery stores in independent testing. Wild-caught or domestic-farmed options are meaningfully different.
Apples, pears, and stone fruit — go organic.
These are the crops where antibiotic application to the plant itself is documented. Streptomycin and oxytetracycline are sprayed directly on these trees. Organic certification prohibits this use in the US.
Address water.
Antibiotic compounds in municipal and well water are a chronic low-level exposure. A high-quality whole-house or point-of-use carbon filter reduces many pharmaceutical residues. This isn't a complete solution, but it's a meaningful reduction.
Dairy and eggs last — because the label hierarchy is more complex here.
The residue picture in dairy and eggs is real but more variable. Understanding what the labels actually mean helps you navigate this without paying premium prices for claims that don't deliver.
Meat and Poultry: What the Labels Mean
Meat labeling is intentionally confusing. Some terms are regulated with third-party verification. Others are legally defined but meaningfully weak. Some are marketing with no regulatory weight at all.
Prohibits the use of antibiotics at any point in the animal's life. If an animal must be treated with antibiotics for illness, it must be removed from the organic program. Third-party verified. This is the strongest label for antibiotic avoidance on meat.
Carries the same prohibition as organic for antibiotic use, but doesn't require the full suite of organic standards (feed, access to pasture, etc.). Must be verified by USDA's Agricultural Marketing Service. Look for the USDA shield on the label.
Third-party certifications that include antibiotic restrictions alongside animal welfare standards. GAP Step 4 and above prohibit routine antibiotic use. These are not as widely available but are genuinely meaningful when found.
Without the USDA Process Verified shield, these are self-reported claims. The USDA has rules against fraudulent labeling, but enforcement is not robust. Some large producers have used these claims and been found by independent testing to have residues in their products. Seek third-party verification.
Says nothing about antibiotics. This label exists because growth hormones are used in beef cattle; poultry cannot legally receive hormones anyway, making the claim meaningless on a chicken label.
USDA defines "natural" as minimally processed and containing no artificial ingredients. It says nothing about how the animal was raised, what it was fed, or whether it received antibiotics. This label is meaningless for antibiotic avoidance.
Without third-party certification (AWA, Certified Humane, GAP), this is a self-reported marketing claim. It has no regulatory definition and no bearing on antibiotic use.
Seafood: What to Avoid and What's Safer
The single most impactful seafood change most people can make is eliminating farmed shrimp from countries with weak antibiotic regulation. This is not a perfect rule — not all international aquaculture is the same — but it is a reliable starting point given the documented residue findings in retail testing.
| Category | Concern Level | Notes |
|---|---|---|
| Farmed shrimp — Vietnam, Thailand, India, Bangladesh | High | Repeatedly found with banned drug residues and resistant bacteria in independent US retail testing |
| Farmed tilapia — China, Indonesia | High | Dense aquaculture conditions; minimal regulatory oversight; fluoroquinolone and tetracycline use documented |
| Farmed Atlantic salmon — any origin | Moderate | Antibiotic use has decreased substantially in Norway (now minimal); Chile still uses significant antibiotics; check origin |
| Wild-caught Pacific salmon | Low | No antibiotics administered; variable mercury and microplastic concerns but not antibiotic |
| Wild-caught Alaskan seafood (pollock, cod, halibut) | Low | Not farmed; no antibiotic exposure |
| US farmed catfish | Low-Moderate | Domestic regulation is stricter; USDA does mandatory testing for residues in catfish |
| Wild-caught shrimp — Gulf of Mexico, Pacific coast | Low | Not farmed; environmental contamination is a separate concern in the Gulf |
On "antibiotic-free" seafood labels
Some farmed seafood carries antibiotic-free claims. These are not federally regulated the way USDA meat labels are. Third-party certifications like Best Aquaculture Practices (BAP) 4-star, Marine Stewardship Council (MSC), and Aquaculture Stewardship Council (ASC) are more meaningful than label language alone.
Produce: Where Organic Matters for Antibiotics Specifically
Most organic produce purchasing decisions are driven by pesticide residue data. But for antibiotic exposure, a narrower and more specific concern applies: tree fruits. Streptomycin and oxytetracycline are applied to apples, pears, and stone fruits (peaches, nectarines, cherries, apricots) during bloom to prevent fire blight. USDA organic certification for tree fruits prohibits streptomycin use in the United States — this prohibition became fully effective in 2014.
If your budget doesn't allow organic across all produce, prioritize apples, pears, and stone fruits as the category where the organic choice specifically reduces antibiotic exposure. For other fruits and vegetables, the organic decision remains relevant for pesticide and herbicide reasons — but antibiotics applied directly to the plant is not a documented concern in those categories.
Dairy and Eggs: The Label Hierarchy
Dairy cattle are routinely treated with antibiotics for mastitis. Federal regulations require a withdrawal period before the milk enters the supply and require bulk tank testing before processing. The testing system catches many residues but is not comprehensive — not every approved veterinary drug is included in standard screening.
Cows cannot receive antibiotics under any circumstances. If a cow must be treated, she is removed from the organic dairy herd. Feed must also be organic (no antibiotics in feed). Third-party verified.
Certifications like Certified Humane Pasture-Raised require outdoor access but don't necessarily prohibit antibiotics. Better welfare often correlates with lower antibiotic use due to reduced confinement stress, but it is not guaranteed.
Standard withdrawal period and bulk tank testing apply, but full drug screening is not required. Ionophores are commonly used in conventional dairy herds.
For eggs, laying hens are not supposed to be given antibiotics during production. The regulatory gap here is less about approval and more about compliance and withdrawal timing. Organic eggs require that the birds have not received antibiotics and were raised on organic feed. Conventional "cage-free" or "free-range" eggs make no antibiotic claims.
Water: A Chronic Background Exposure
Municipal water treatment is designed to kill bacteria and remove particulates. It is not designed to remove pharmaceutical compounds. Standard water treatment using chlorination and filtration does not reliably eliminate antibiotic residues. Some treatment plants use activated carbon filtration or advanced oxidation processes that can reduce pharmaceutical loads — but this is not universal, and it is not complete.
A whole-house carbon block filter or a high-quality point-of-use carbon filter (not reverse osmosis, which strips beneficial minerals) reduces many pharmaceutical residues. For drinking water specifically, a high-flow carbon filter with a tightly controlled pore size is preferable to pitcher-style filters, which have longer contact time variability and lower surface area. Natural spring water from a tested source remains the cleaner option when available. Find local springs at findaspring.com, and always test before relying on a spring as a primary source.
If you live near a large confined animal feeding operation
Well water in agricultural regions — particularly within a few miles of large hog or poultry operations — has been found to contain significantly higher concentrations of antibiotic compounds and resistant bacteria. If this applies to you, independent water testing specific to antibiotics and resistant bacteria is worth doing. The EPA's Safe Drinking Water Hotline and state agricultural extension offices can point you to certified labs.
Gut Repair: Supporting What Has Already Been Disrupted
If you have been eating from the conventional food supply for years — which most of us have — your microbiome has been operating under a chronic low-level antibiotic pressure. Reducing that pressure going forward matters. So does actively supporting the conditions in which a diverse microbial population can re-establish itself.
The research on microbiome recovery is consistent on one point: diversity of plant foods drives diversity of gut bacteria. Not supplements. Not isolated probiotic strains in capsules. The organisms that make up a resilient gut microbiome are fed by a wide range of prebiotic fibers — the structural carbohydrates found in vegetables, legumes, whole grains, and fruit — and they are sourced from the environment, from fermented foods, and from the naturally occurring bacteria on fresh, soil-grown produce.
Fermented foods in their whole, traditionally prepared form provide living organisms along with the substrates that feed them: raw sauerkraut (genuinely unpasteurized, refrigerated), naturally fermented pickles, kimchi, kefir made from full-fat milk, and traditionally prepared yogurt with live cultures. These are not equivalent to probiotic capsules. The food matrix matters. The diversity of organisms in a traditionally fermented vegetable exceeds what any capsule delivers, and they arrive with the food compounds that support their survival in the gut.
Prebiotic foods — those that feed the beneficial organisms already present — include garlic, leeks, onions, asparagus, Jerusalem artichokes, under-ripe bananas, cooked and cooled potatoes and rice (resistant starch), and a wide range of legumes. Variety matters more than any single food. The goal is to feed as many different microbial populations as possible, which means rotating through different food sources rather than eating the same things daily.
What not to reach for Isolated probiotic supplements are not sufficient as a gut repair strategy when the underlying exposure is ongoing and the diet doesn't support microbial diversity. Activated charcoal, chlorella, cilantro protocols, and similar "detox" approaches are not appropriate here — the concern is a long-term microbiome shift, not an acute toxic load that requires binding. Whole food. Diversity. Reduced ongoing exposure. That's the framework.
Agricultural Antibiotic Reference
The drugs used in US food production — manufacturer brands, what animals receive them, known side effects, and their human medicine crossover. Every drug listed here has a documented presence in the human food supply.
| Drug Name | Brand / Manufacturer | Animals | Use in Livestock | Known Effects & Concerns | Human Crossover |
|---|---|---|---|---|---|
| OxytetracyclineTetracycline | Terramycin (Zoetis), Pennox, Liquamycin, AgriMycin 200 | Cattle, swine, poultry, fish, orchards (crops) | Respiratory infections, scours, foot rot, mastitis, growth promotion, fire blight spray on apples/pears | Residues in muscle tissue, liver, kidney; impairs bone development in young animals; chelates minerals in gut; disrupts microbiome at subtherapeutic doses | Same drug class as doxycycline (Lyme, acne, respiratory). Resistance to oxytetracycline confers resistance to human tetracyclines. Residues detected in retail meat and orchard fruits. |
| ChlortetracyclineTetracycline | Aureomycin (Zoetis), CTC 10, Pennchlor | Cattle, swine, poultry | Growth promotion, respiratory disease prevention, anaplasmosis treatment in cattle | Significant microbiome disruption at subtherapeutic doses; residues in meat and eggs; persistent in soil and water from manure | Cross-resistance to all tetracyclines. One of the most detected antibiotics in US agricultural water runoff. |
| TylosinMacrolide | Tylan (Elanco), Tylosin 200 | Cattle, swine, poultry | Liver abscess prevention in feedlot cattle, respiratory disease, growth promotion in swine | Broad microbiome disruption; environmentally persistent in manure-amended soils; detected in groundwater near feedlots | Drives resistance to erythromycin, clarithromycin, and azithromycin (Z-Pack) — the most prescribed antibiotic in US outpatient medicine. WHO classifies macrolide resistance as a critical priority. |
| ErythromycinMacrolide | Gallimycin (Bimeda), Erythro-200 | Cattle, poultry | Respiratory infections, Mycoplasma, CRD in poultry | Same drug used in human medicine; direct resistance selection for the macrolide class | Direct human analogue. Cross-resistance to azithromycin, clarithromycin. Resistance in Campylobacter from poultry is a documented human health concern. |
| Penicillin GBeta-Lactam | Agri-Cillin, Pro-Pen-G, Flo-Cillin (various manufacturers) | Cattle, swine, poultry | Respiratory infections, foot rot, mastitis, shipping fever | Residues in milk if withdrawal periods not followed; residues in meat; drives beta-lactam resistance in gut bacteria of treated animals | The original antibiotic; still the first-line drug for strep throat, dental infections, syphilis. Beta-lactam resistance (including extended-spectrum beta-lactamases, ESBLs) is one of the leading resistance threats globally. |
| AmoxicillinBeta-Lactam | Amoxi-Inject, Biomox (various) | Swine, poultry, cattle | Respiratory and GI bacterial infections | Same molecule as human amoxicillin; drives ESBL resistance in food-animal populations | The most commonly prescribed antibiotic for children in the US. ESBL-producing E. coli from food animals are increasingly causing human urinary tract and bloodstream infections. |
| EnrofloxacinFluoroquinolone | Baytril (Bayer/Elanco) | Cattle, swine (poultry use withdrawn 2005 by FDA) | Respiratory infections, systemic bacterial disease, E. coli infections | Cartilage damage in young animals; tendon effects; significant resistance selection; FDA withdrew poultry approval specifically due to fluoroquinolone-resistant Campylobacter in humans | Veterinary analogue of ciprofloxacin (Cipro). Fluoroquinolone-resistant Campylobacter from poultry causes an estimated 8,000+ cases of treatment failure in human medicine annually in the US. |
| SulfamethazineSulfonamide | Sulmet (Bayer), Sulfa-Max, various generics | Cattle, swine, poultry | Respiratory infections, coccidiosis, shipping fever | Residues in meat and milk; FDA has issued multiple regulatory actions for sulfonamide residue violations in veal and pork | Related to sulfamethoxazole — the "sulfa" component of Bactrim (TMP-SMX), used for UTIs, MRSA, Pneumocystis pneumonia. Sulfonamide resistance now widespread in food-animal E. coli. |
| StreptomycinAminoglycoside | Agri-Mycin 17 (Nufarm), Firewall | Orchards (apple, pear, stone fruit crops) | Fire blight control — sprayed directly on orchard trees during bloom. Oxytetracycline also registered for this use. | Environmental persistence in soil; resistance selection in orchard microbiomes; drift onto neighboring crops and water | Streptomycin is used in human medicine for tuberculosis and certain resistant infections. Organic certification prohibits streptomycin on tree fruits — one of the clearest cases where the organic label means a real documented difference in exposure. |
| NeomycinAminoglycoside | Neo-Sol, Neomycin Sulfate (various) | Cattle, swine, poultry | Scours (neonatal diarrhea), GI infections | GI absorption low but residues detected in liver/kidney; significant resistance selection | Used topically in human medicine (Neosporin). Oral neomycin is used for hepatic encephalopathy. Cross-resistance affects gentamicin and tobramycin — drugs used for life-threatening hospital infections. |
| MonensinIonophore | Rumensin (Elanco), Coban | Cattle, poultry | Feed efficiency (growth promotion), coccidiosis prevention, bloat prevention in feedlot cattle | Cardiotoxic to horses, dogs, and humans — not approved for use in these species; no required withdrawal period before slaughter; biologically active in every animal receiving it; classified FDA "non-medically important" which removes standard oversight | Not used in human medicine — too toxic. No withdrawal period means animals can be slaughtered while on the drug. Not tracked in standard FDA antibiotic sales reporting. Disrupts gut microbiome of treated animals; full human exposure impact unstudied. |
| SalinomycinIonophore | Bio-Cox (Huvepharma), Sacox | Poultry (broilers) | Coccidiosis prevention — given continuously throughout grow-out | Lethal to horses, some dogs; human toxicity documented (muscle damage, neurological effects); no withdrawal period; not tracked in antibiotic use reporting | Not a human antibiotic — but studied as a cancer compound (anti-cancer stem cell properties). Classified as "non-medically important" despite clear biological activity in consuming animals. |
| NarasinIonophore | Monteban (Elanco) | Poultry (broilers) | Coccidiosis prevention; sometimes used in combination with nicarbazin | No withdrawal period; combined products (Maxiban = narasin + nicarbazin) used continuously; not tracked separately in FDA reporting | No human medical use. No withdrawal period. Not subject to the same oversight as medically important antibiotics. Residue impact in broiler chicken consumers not studied. |
| Colistin (Polymyxin E)Polymyxin — Last Resort | Colistin sulfate (various international manufacturers) | Swine, poultry, cattle — used in countries exporting food to the US | GI bacterial infections — used extensively in Asia, Europe, Latin America as a growth promoter and disease treatment | Kidney toxicity in animals; drives mcr-1 resistance gene — the first transferable colistin resistance mechanism identified | The drug physicians use when a patient has a carbapenem-resistant infection and almost nothing else will work. The mcr-1 gene was found in Chinese livestock in 2015, human clinical isolates in dozens of countries within months, and US livestock and humans within two years. Colistin resistance spreading from a livestock source is a documented case of agricultural antibiotic use producing a life-threatening human medicine failure. |
| VirginiamycinStreptogramin | V-Max (Phibro Animal Health), Stafac | Cattle, swine, poultry, turkeys | Growth promotion, feed efficiency, necrotic enteritis prevention in poultry | Drives resistance to the entire streptogramin class | Cross-resistance to quinupristin/dalfopristin (Synercid) — one of the few drugs that can treat vancomycin-resistant Enterococcus faecium (VRE). A last-resort antibiotic losing effectiveness because the same class is being fed to livestock for growth promotion. |
What "manufacturer" means in this context The veterinary pharmaceutical market is dominated by the same companies that produce human medications — Zoetis (formerly Pfizer Animal Health), Elanco (formerly Lilly), Bayer Animal Health (now part of Elanco), Merck Animal Health, Boehringer Ingelheim. The same corporations profiting from treating resistant infections in humans also profit from selling the antibiotics that create those resistant infections in food animals.
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