Hi there, Thanks for your query. Once you are all right, you should have your stools cultured for salmonella. If this bacteria is grown, it means that you are harboring these organisms and likely to transmit it to others. A longer course of antibiotics is required to eliminate the bacteria completely. Widal s test has no relevance. To prevent from water-borne diseases (including typhoid), use filtered water, avoid eating outside. In case of any further queries, revert back to me THROUGH DIRECT PREMIUM QUERY (Paid), addressed to me personally. You will receive- almost immediately- my response in great details. If you find my response helpful and informative, do not forget an “excellent” (5-star rating) to my answer, to ENCOURAGE ALL doctors- engaged in social service- to render sound advice to the FREE queries. Fond regards and have a nice day Dr. Rakesh Karanwal