<prompt> Sal monella infection is most commonly caused by-Infected waterInfected vegetableAerosol infectionThrough skin  <response>: Ans. is 4a b i.e., Infected water Infected vegetable Transmission of salmonella tvphio Typhoid fever is transmitted via the faecal-oral route or urine-oral routes. This may take place directly through soiled hands contaminated with faeces or urine of cases or carriers, or indirectly by the ingestion of contaminated water, milk andor food, or through files.Dynamics of typhoid fever transmission 