Zoonotic bacteria can be transmitted between vertebrates and humans and they can cause symptoms in both. The most commonly known zoonotic bacteria are salmonella and campylobacter. Though, zoonotic bacteria do not always cause a disease in animals (e.g. campylobacter in poultry). Zoonotic bacteria can also develop resistance towards antibiotics as a result of antibiotic treatment, for example, as well as spread resistance factors from one bacterium to another. Humans may get the bacteria from animals, food products, the environment or water. The transmission of zoonotic antimicrobial resistant bacteria from animals to humans can significantly hinder antibiotic treatment of infectious diseases in people.