It is reported that 23,000 people die in the U.S. every year from antibiotic resistant infections (CDC). That toll is estimated to rise to 10 million worldwide by 2050. Although much of this resistance is due to the overuse of antibiotics by physicians and patients, e.g. treating a virus with an antibiotic, more antibiotics are being used by animal agriculture than are used for human use.
Antibiotics should not be given for promoting animal growth but only to treat sick animals. The labels are tricky, so read them carefully when choosing poultry, beef or pork products.