IS FOOD POISONING CONTAGIOUS? Food poisoning itself is not contagious. Food poisoning typically occurs when someone consumes contaminated food or water that contains harmful bacteria, viruses, parasites, or toxins. The illness is caused by ingesting these harmful substances, not by person-to-person transmission. However, in some cases, the same contaminated food or water that caused one … Continue reading FOOD POISONING , IS IT CONTAGIOUS?