John Burston1, Sebastian van Hal2, Sally Dubedat2, Andie Lee2. 1. Department of Microbiology and Infectious Diseases, Royal Prince Alfred Hospital, Sydney, Australia; Department of General Medicine, Calvary Mater Hospital, Newcastle, Australia. Electronic address: jrburston@gmail.com. 2. Department of Microbiology and Infectious Diseases, Royal Prince Alfred Hospital, Sydney, Australia.