title: Response to letters.
authors.affiliation: Department of Infectious Diseases, Austin Hospital, Heidelberg, Victoria, Australia; Victorian Infectious Diseases Service, Royal Melbourne Hospital, Parkville, Victoria, Australia.
authors.forename: Joseph
authors.initials: J
authors.lastname: Torresi
authors.forename: Douglas F
authors.initials: DF
authors.lastname: Johnson
authors.forename: Karin
authors.initials: K
authors.lastname: Leder
mesh_terms: D005260:Female; D006509:Hepatitis B; D006526:Hepatitis C; D006801:Humans; D008297:Male; D014195:Travel