Table 1. Number of new HIV diagnoses notified in Australia, cumulative to 31 December 2017, by month and year of HIV diagnosis

Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual Total
1984-2006	2,474	2,287	2,329	2,058	2297	2611	2198	2242	2202	2243	2354	2009	27304
2007	81	94	77	70	109	62	72	84	64	72	82	81	948
2008	78	88	79	69	85	76	76	72	55	95	69	59	901
2009	73	80	68	90	70	84	90	64	83	79	86	78	945
2010	71	84	83	81	79	73	78	73	79	66	75	66	908
2011	67	95	84	84	97	85	79	84	83	76	75	73	982
2012	78	103	109	74	86	70	88	104	85	109	95	65	1066
2013	74	81	77	83	94	88	94	96	90	95	94	66	1032
2014	105	96	98	84	91	84	97	81	94	88	80	86	1084
2015	81	80	80	84	74	81	105	81	85	87	96	92	1026
2016	106	93	85	88	89	82	74	93	89	98	59	57	1013
2017	88	76	75	81	92	82	83	78	69	89	80	70	963
Monthly Total	3376	3257	3244	2946	3263	3478	3134	3152	3078	3197	3245	2802	38172

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Late and advanced HIV diagnoses

Timely diagnosis of HIV infection can reduce an individual’s risk of morbidity and mortality, and have public health benefits by providing opportunities to reduce onward transmission, through mitigation of risk behaviours or commencing treatment to reduce infectivity.

These outcomes are monitored by measuring the proportion of HIV cases which are (i) diagnosed late, and (ii) diagnosed with advanced HIV.

A late diagnosis is indicated by a CD4+ cell count below 350 and suggests the infection was acquired around 4-5 years earlier. The CD4+ cell count reflects the level of circulating lymphocytes that are key components of the immune system.

Advanced HIV is when the CD4+ cell count falls below 200, a level which can lead to Acquired Immunodeficiency Syndrome (AIDS), a disease characterised by opportunistic infections and cancers that are rare in people with normal immune systems.

Table 2. Proportion of new HIV notifications diagnosed as “late” (i.e. with a CD4+ cell count below 350) in Australia, cumulative to 31 December 2017, by month and year of HIV diagnosis

Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual Total
2017	32%	37%	35%	37%	54%	30%	33%	34%	36%	29%	41%	29%	36%

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Table 3. Proportion of new HIV notifications diagnosed as “advanced” (i.e. with a CD4+ cell count below 200) in Australia, cumulative to 31 December 2017, by month and year of HIV diagnosis

Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual Total
2017	22%	22%	21%	18%	28%	21%	22%	23%	32%	22%	21%	20%	23%

For further information on these tables please contact:
Surveillance and Evaluation Program for Public Health
The Kirby Institute for infection and immunity in society
University of New South Wales
Sydney 2052 Australia

Telephone: +61 2 9385 0900
Facsimile: +61 2 9385 0920
Email: The Kirby Institute
Website: The Kirby Institute for infection and immunity in society

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