The more-than-two-years-or-unknown-duration syphilis category is an Australian notifiable-disease surveillance construct that separates confirmed syphilis cases not meeting the less-than-two-year infectious definition [1]. Inclusion requires reactive treponemal serology confirmed by a non-treponemal or additional treponemal test, with no documented adequate prior treatment or endemic treponemal disease [1]. It is a combined reporting classification encompassing infection timing that is either older than two years or unspecified [1].
Disease overview
BacterialSyphilis over two years or unspecified duration
病程超过两年或病程未明的梅毒
Follow this disease Compare countries Evidence-backed information EN 1/5 applicable sections · ZH 1/5 applicable sections Updated Oct 23, 2026
Australian national surveillance classifies adult syphilis notifications into infectious cases of less than two years and a combined category of more than two years or unknown duration [1]. The latter represents a reporting bucket rather than a distinct pathogen or transmission route, aggregating infections with differing or uncertain timing [1]. This classification should be preserved in trend analyses without merging the duration categories [1].
Read the full clinical and epidemiological profile 2
- 1 Australian Government Department of Health and Aged Care. Department of Health and Aged Care | Australia's notifiable diseases status, 2005: Annual report of the National Notifiable Diseases Surveillance System - Sexually transmissible diseases [Internet]. cited 23 Oct 2026. Available from: https://www1.health.gov.au/internet/main/publishing.nsf/Content/cda-cdi3101a12.htm
- A52-A53
- 1A70
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