Humans clean the feces, which contain the bacteria, of the animals on farms. During the cleaning process, humans may get bacteria on their body and hands. If the body or hands are not properly cleaned, the bacteria could be ingested by the person. Likewise, in slaughterhouses, during slaughter, the intestine is severed. Resistant bacteria are exposed to slaughterhouse workers, which could get the bacteria on their bodies and hands.
Transmission occurs when the bacteria is ingested.
Along with the previous sources of contamination, humans can get infected by eating meat from animals with resistant bacteria. Even though cooking reduces the survival of the bacteria, some may still survive and infect the human. After initial transmission and infection to humans, the transmission to other humans has a couple paths. An infected individual may also be admitted to a hospital for treatment. Treatment may not work in drug resistant bacteria, therefore, identifying a drug resistant infection.