They can be transmitted from person-to-person contact, person-to-food-then-to-person contact, when somebody eats contaminated food, or they can be transmitted through the water.
Pot fi transmise prin contact personal, persoana-persoana, contact prin mancare, persoana-mancare-persoana, atunci cand cineva mananca mancare contaminata. Sau pot fi transmise prin intermediul apei.