Final answer:
Veterinarians and others working with farm animals often carry antibiotic-resistant bacteria due to the excessive use of antibiotics in animal feed that promotes resistance, which can spread to humans.
Step-by-step explanation:
Individuals, such as veterinarians, who work closely with farm animals treated with antibiotics tend to carry antibiotic resistance as a result. The development and spread of antibiotic-resistant bacteria are major public health concerns. One of the primary causes of antibiotic resistance is the excessive use of antibiotics in both humans and livestock. In the United States, a considerable proportion of antibiotics produced are administered to animals, not to prevent disease but to enhance product yield. This routine use of antibiotics in animal feed at low doses increases the likelihood of resistant bacteria evolving. Such bacteria can be transferred from animals to humans, signaling a significant challenge for the treatment of bacterial infections as the resistant bacteria may not respond to traditional antibiotic treatments.