Aerobic gram negative rod
Humans/animals are the reservoir (i.e. reptiles - turtles/lizards, transovarial transmission in chickens-> eggs).
Fecal-oral transmission or ingestion of contaminated water/food.
Gastrointestinal disease is generally self-limited illness which should not be treated with antibiotics. Treat if immunosuppressed/bacteremic, high fever, or hospitalized.