In NSW and Victoria, only passengers and crew who had attended the Kokoda trail tour were interviewed. All passengers and crew who were interviewed were asked to submit at least one faecal specimen. In some States blood and urine samples were requested as well. Passengers and crew who were working in occupations with a high risk for transmission for Salmonella typhi were required to submit three faecal specimens, with clearance for return to work pending return of negative samples . In the intervening period between the detection of the first case and 30 June 1999 a total of 12 participants of the Kokoda Trail tour had Salmonella typhi detected in specimens.
Surveillance is ongoing.