[1] Univ Adelaide, Res Ctr Infect Dis, Adelaide, SA, Australia
[2] Peter Doherty Inst Infect & Immun, Melbourne, Vic, Australia
[3] Victorian Infect Dis Reference Lab, Melbourne, Vic, Australia
[4] Royal Adelaide Hosp, Dept Gastroenterol & Hepatol, Adelaide, SA, Australia
[5] SA Pathol, Surg Pathol, Adelaide, SA, Australia