Surveillance Update

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for Notifiable Sexually Transmitted Infections and

Blood-Borne Viruses in the Northern Territory

Vol. 16, No. 1 January-March 2015

Centre for Disease Control

Department of Health

Northern Territory Government

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Table of Contents

A. Introduction ... 3

B. Chlamydia ... 4

C. Gonorrhoea ... 6

D. Trichomoniasis ... 8

E. Infectious syphilis ... 10

F. Hepatitis B virus infection ... 12

G. Hepatitis C virus infection... 14

H. HIV ... 16

I. Readers’ responses ... 18

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Surveillance Update for Notifiable STIs and BBVs in the NT. Vol. 16(1), Jan-Mar 2015 Page 3

A. Introduction

Starting from January 2015, this Surveillance Update will be changed to be published every quarter, and the focus of the report will be changed to report the surveillance data on notifiable sexually transmitted infections (STIs) and blood-borne viruses (BBVs) in the Northern Territory (NT) with only minimal explanatory or commentary text. Detailed analyses on the trends and patterns of disease occurrences will be covered in an annual epidemiology report which will be published separately in 2016.

The notification data used in this report were extracted from the Northern Territory Notifiable Diseases System (NTNDS) on 15 October 2015. Unless specified otherwise, all STI data are for genital infections. Notifications with a non-NT residential address were excluded from the report.

Other data used in this report include enhanced surveillance data for infectious syphilis from the NT Syphilis Register Information System, HIV notification data from the HIV/AIDS database maintained by the SHBBVU. Population data used in rate calculation are estimated resident population prepared and provided by the Health Gains Planning unit (updated in 2014), which were derived from Census data retrieved from the Australian Bureau of Statistics. All rates for 2015 were calculated using population data for 2014 because the population data for 2015 were not available at the time of the report writing.

All surveillance data of the NT presented in this report are provisional and subject to

future revision. The quarterly rates of notification presented in this report are all

crude annualised rates per 100,000 population. Where appropriate, the five-year

mean of the corresponding numbers of notifications for 2010-2014 are also

presented for comparison purposes.

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B. Chlamydia

Figure B.1 Quarterly number and annualised rate (per 100,000 population) of chlamydia notifications in the NT, 2010-2015 (Q1)

Table B.1 Number of chlamydia notifications in the NT by age group, Jan-Mar, 2015

Age group

Prior 5-year mean for Jan-Mar

quarter (2010-2014) Jan-Mar 2015 Increase over prior 5-year

mean Number Proportion Number Proportion

<10 1.6 0.2% 2 0.3% 25.0%

10-14 15.6 2.3% 21 2.8% 34.6%

15-19 182.0 26.9% 179 24.1% -1.6%

20-24 211.2 31.2% 234 31.5% 10.8%

25-29 125.6 18.6% 135 18.1% 7.5%

30-34 58.4 8.6% 86 11.6% 47.3%

35-39 35.2 5.2% 33 4.4% -6.3%

40-44 22.0 3.3% 21 2.8% -4.5%

45-49 12.2 1.8% 13 1.7% 6.6%

50-54 6.4 0.9% 10 1.3% 56.3%

55-59 3.0 0.4% 7 0.9% 133.3%

60+ 3.2 0.5% 3 0.4% -6.3%

Total 676.4 744 10.0%

Table B.2 Number of chlamydia notifications in the NT by sex, Jan-Mar, 2015

Sex

Prior 5-year mean for Jan-

Mar quarter (2010-2014) Jan-Mar 2015 Increase over prior 5-year

Female

402.0 59.4% 435 58.5% 8.2%

Male

274.4 40.6% 309 41.5% 12.6%

Total 676.4 744

10.0%

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Table B.3 Number of chlamydia notifications in the NT by Aboriginal status, Jan-Mar, 2015

Aboriginal status

Five year mean for Jan-Mar

Aboriginal

387.6 57.3% 451 60.6% 16.4%

Non-Aboriginal

242.4 35.8% 240 32.3% -1.0%

Unknown

46.4 6.9% 53 7.1% 14.2%

Total 676.4 744 10.0%

Table B.4 Number of chlamydia notifications in the NT by district, Jan-Mar, 2015

District

Five year mean for Jan-

Alice Springs Rural

93.0 13.7% 98 13.2%

5.4%

Alice Springs Urban

94.0 13.9% 110 14.8%

^17.0%

Barkly

17.6 2.6% 25 3.4%

42.0%

Darwin Rural

51.2 7.6% 57 7.7%

11.3%

Darwin Urban

290.0 42.9% 284 38.2%

^-2.1%

East Arnhem

53.2 7.9% 60 8.1%

12.8%

Katherine

77.4 11.4% 110 14.8%

^42.1%

Total 676.4 744

^10.0%

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C. Gonorrhoea

Figure C.1 Quarterly number and annualised rate (per 100,000 population) of gonorrhoea notifications in the NT, 2010-2015 (Q1)

Table C.1 Number of gonorrhoea notifications in the NT by age group, Jan-Mar, 2015

Age group

<10 0.2 0.0% 3 0.6% 1400.0%

10-14 13.4 3.0% 17 3.4% 26.9%

15-19 120.4 26.5% 125 25.2% 3.8%

20-24 120.8 26.6% 119 24.0% -1.5%

25-29 79.4 17.5% 73 14.7% -8.1%

30-34 50.6 11.1% 69 13.9% 36.4%

35-39 30.4 6.7% 41 8.3% 34.9%

40-44 18.0 4.0% 17 3.4% -5.6%

45-49 9.4 2.1% 15 3.0% 59.6%

50-54 5.8 1.3% 8 1.6% 37.9%

55-59 2.2 0.5% 4 0.8% 81.8%

60+ 3.6 0.8% 5 1.0% 38.9%

Total 454.2 496 9.2%

Table C.2 Number of gonorrhoea notifications in the NT by sex, Jan-Mar, 2015

Sex

Female

233.6 51.4% 253 51.0% 8.3%

Male

^220.6 ^48.6% ²⁴³ ^49.0% ^10.2%

Total 454.2 496

9.2%

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Table C.3 Number of gonorrhoea notifications in the NT by Aboriginal status, Jan-Mar, 2015

Aboriginal status

Aboriginal

403.0 88.7% 430 86.7% 6.7%

Non-Aboriginal

42.6 9.4% 61 12.3% 43.2%

Unknown

8.6 1.9% 5 1.0% -41.9%

Total 454.2 496 9.2%

Table C.4 Number of gonorrhoea notifications in the NT by district, Jan-Mar, 2015

District

Alice Springs Rural

134.6 29.6% 130 26.2%

-3.4%

Alice Springs Urban

81.0 17.8% 103 20.8%

^27.2%

Barkly

17.8 3.9% 25 5.0%

40.4%

Darwin Rural

35.8 7.9% 33 6.7%

-7.8%

Darwin Urban

74.6 16.4% 80 16.1%

^7.2%

East Arnhem

28.4 6.3% 38 7.7%

33.8%

Katherine

82.0 18.1% 87 17.5%

^6.1%

Total 454.2 496

^9.2%

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D. Trichomoniasis

Figure D.1 Quarterly number and annualised rate (per 100,000 population) of trichomoniasis notifications in the NT, 2010-2015 (Q1)

Table D.1 Number of trichomoniasis notifications in the NT by age group, Jan-Mar, 2015

Age group

<10 0.4 0.1% 0 0.0% -100.0%

10-14 15.0 2.3% 26 3.0% 73.3%

15-19 106.0 16.6% 147 16.7% 38.7%

20-24 117.0 18.3% 159 18.1% 35.9%

25-29 97.8 15.3% 127 14.4% 29.9%

30-34 72.0 11.3% 120 13.7% 66.7%

35-39 73.8 11.6% 76 8.6% 3.0%

40-44 70.0 11.0% 98 11.1% 40.0%

45-49 44.8 7.0% 66 7.5% 47.3%

50-54 19.6 3.1% 34 3.9% 73.5%

55-59 11.6 1.8% 9 1.0% -22.4%

60+ 10.6 1.7% 17 1.9% 60.4%

Total 638.6 879 37.6%

Table D.2 Number of trichomoniasis notifications in the NT by sex, Jan-Mar, 2015

Sex

Female

550.6 86.2% 734 83.5% 33.3%

Male

^88.0 ^13.8% ¹⁴⁵ ^16.5% ^64.8%

Total 638.6 879

37.6%

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Table D.3 Number of trichomoniasis notifications in the NT by Aboriginal status, Jan- Mar, 2015

Aboriginal status

Aboriginal

^613.0 ^96.0% ⁸⁴¹ ^95.7% ^37.2%

Non-Aboriginal

18.4 2.9% 26 3.0% 41.3%

Unknown

^7.2 ^1.1% ¹² ^1.4% ^66.7%

Total 638.6 879 37.6%

`

Table D.4 Number of trichomoniasis notifications in the NT by district, Jan-Mar, 2015

District

Alice Springs Rural

103.2 16.2% 122 13.9%

18.2%

Alice Springs Urban

47.0 7.4% 88 10.0%

^87.2%

Barkly

39.0 6.1% 58 6.6%

48.7%

Darwin Rural

124.6 19.5% 164 18.7%

31.6%

Darwin Urban

79.0 12.4% 127 14.4%

^60.8%

East Arnhem

110.6 17.3% 139 15.8%

25.7%

Katherine

135.2 21.2% 181 20.6%

^33.9%

Total 638.6 879

^37.6%

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E. Infectious syphilis

Figure E.1 Quarterly number and annualised rate (per 100,000 population) of infectious syphilis notifications in the NT, 2010-2015 (Q1)

Table E.1 Number of infectious syphilis notifications in the NT by age group, Jan-Mar, 2015

Age group

quarter (2010-2014) Jan-Mar 2015 Increase over prior 5-year mean Number Proportion Number Proportion

10-14 0.2 2.7% 1 2.6% 400.0%

15-19 1.4 18.9% 9 23.7% 542.9%

20-24 2.2 29.7% 8 21.1% 263.6%

25-29 0.8 10.8% 5 13.2% 525.0%

30-34 0.6 8.1% 4 10.5% 566.7%

35-39 0.6 8.1% 3 7.9% 400.0%

40-44 0.2 2.7% 5 13.2% 2400.0%

45-49 0.6 8.1% 1 2.6% 66.7%

50-54 0.4 5.4% 1 2.6% 150.0%

55-59 0.2 2.7% 1 2.6% 400.0%

60+ 0.2 2.7% 0 0.0% -100.0%

Total 7.4 38 413.5%

Table E.2 Number of infectious syphilis notifications in the NT by sex, Jan-Mar, 2015

Sex

Female

3.2 43.2% 11 28.9% 243.8%

Male

^4.2 ^56.8% ²⁷ ^71.1% ^542.9%

Total 7.4 38

413.5%

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Table E.3 Number of infectious syphilis notifications in the NT by Aboriginal status, Jan-Mar, 2015

Aboriginal status

Aboriginal

^6.0 ^81.1% ³⁷ ^97.4% ^516.7%

Non-Aboriginal

1.8 23.6% 1 2.6% -42.9%

Total 7.4 38 413.5%

Table E.4 Number of infectious syphilis notifications in the NT by district, Jan-Mar, 2015

District

Alice Springs Rural

2.5 33.8% 14 36.8%

^460.0%

Alice Springs Urban

2.0 27.0% 5 13.2%

150.0%

Barkly

3.0 40.5% 0 0.0%

^-100.0%

Darwin Rural

1.0 13.5% 2 5.3%

^100.0%

Darwin Urban

2.5 33.8% 3 7.9%

20.0%

East Arnhem

1.5 20.3% 1 2.6%

^-33.3%

Katherine

2.7 36.0% 13 34.2%

387.5%

Total 7.4 38

413.5%

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F. Hepatitis B virus infection

Figure F.1 Quarterly number and annualised rate (per 100,000 population) of hepatitis B notifications in the NT, 2010-2015 (Q1)

Table F.1 Number of hepatitis B notifications in the NT by age group, Jan-Mar, 2015

Age group

10-14 0.6 0.8% 0 0.0% -100.0%

15-19 4.4 6.1% 4 6.8% -9.1%

20-24 6.8 9.4% 6 10.2% -11.8%

25-29 12.2 16.9% 9 15.3% -26.2%

30-34 10.6 14.6% 5 8.5% -52.8%

35-39 8.2 11.3% 8 13.6% -2.4%

40-44 5.6 7.7% 7 11.9% 25.0%

45-49 7.0 9.7% 8 13.6% 14.3%

50-54 4.0 5.5% 6 10.2% 50.0%

55-59 4.6 6.4% 5 8.5% 8.7%

60+ 8.4 11.6% 1 1.7% -88.1%

Total 72.4 59 -18.5%

Table F.2 Number of hepatitis B notifications in the NT by sex, Jan-Mar, 2015

Sex

Female

^27.6 ^38.1% ²⁸ ^47.5% ^1.4%

Male

^44.8 ^61.9% ³¹ ^52.5% ^-30.8%

Total 72.4 59

-18.5%

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Table F.3 Number of hepatitis B notifications in the NT by Aboriginal status, Jan-Mar, 2015

Aboriginal status

Aboriginal

^36.0 ^49.7% ³¹ ^52.5% ^-13.9%

Non-Aboriginal

31.4 43.4% 21 35.6% -33.1%

Unknown

^5.0 ^6.9% ⁷ ^11.9% ^40.0%

Total 72.4 59 -18.5%

Table F.4 Number of hepatitis B notifications in the NT by district, Jan-Mar, 2015

District

Alice Springs Rural

8.6 11.9% 4 6.8%

-53.5%

Alice Springs Urban

7.0 9.7% 13 22.0%

85.7%

Barkly

1.3 1.7% 2 3.4%

60.0%

Darwin Rural

5.2 7.2% 4 6.8%

-23.1%

Darwin Urban

32.8 45.3% 26 44.1%

-20.7%

East Arnhem

12.2 16.9% 6 10.2%

-50.8%

Katherine

7.0 9.7% 4 6.8%

-42.9%

Total

72.4 59

-18.5%

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G. Hepatitis C virus infection

Figure G.1 Quarterly number and annualised rate (per 100,000 population) of hepatitis C notifications in the NT, 2010-2015 (Q1)

Table G.1 Number of hepatitis C notifications in the NT by age group, Jan-Mar, 2015

Age group

10-14 0.2 0.4% 0 0.0% -100.0%

15-19 1.0 2.0% 0 0.0% -100.0%

20-24 3.4 6.9% 1 2.0% -70.6%

25-29 6.0 12.1% 5 10.0% -16.7%

30-34 8.6 17.4% 7 14.0% -18.6%

35-39 6.0 12.1% 4 8.0% -33.3%

40-44 7.0 14.2% 9 18.0% 28.6%

45-49 5.8 11.7% 7 14.0% 20.7%

50-54 5.2 10.5% 5 10.0% -3.8%

55-59 3.6 7.3% 10 20.0% 177.8%

60+ 2.6 5.3% 2 4.0% -23.1%

Total 49.4 50 1.2%

Table G.2 Number of hepatitis C notifications in the NT by sex, Jan-Mar, 2015

Sex

Female

16.4 33.2% 13 26.0% -20.7%

Male

33.0 66.8% 37 74.0% 12.1%

Total 49.4 50

_1.2%

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Table G.3 Number of hepatitis C notifications in the NT by Aboriginal status, Jan-Mar, 2015

Aboriginal status

Aboriginal

8.0 16.2% 9 18.0% 12.5%

Non-Aboriginal

38.8 78.5% 35 70.0% -9.8%

Unknown

2.6 5.3% 6 12.0% 130.8%

Total 49.4 50 1.2%

Table G.4 Number of hepatitis C notifications in the NT by district, Jan-Mar, 2015

District

Alice Springs Rural

0.6 1.2% 0 0.0%

-100.0%

Alice Springs Urban

8.0 16.2% 12 24.0%

50.0%

Barkly

0.8 1.6% 0 0.0%

-100.0%

Darwin Rural

2.4 4.9% 5 10.0%

108.3%

Darwin Urban

32.8 66.4% 31 62.0%

-5.5%

East Arnhem

1.4 2.8% 0 0.0%

-100.0%

Katherine

3.4 6.9% 2 4.0%

-41.2%

Total

49.4 50

1.2%

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H. HIV

Figure H.1 Quarterly number and annualised rate (per 100,000 population) of HIV notifications in the NT, 2010-2015 (Q1)

Table H.1 Number of HIV notifications in the NT by age group, Jan-Mar, 2015

Age group

20-24 0.4 9.5% 0 0.0% -100.0%

25-29 0.8 19.0% 0 0.0% -100.0%

30-34 0.2 4.8% 2 66.7% 900.0%

35-39 0.8 19.0% 0 0.0% -100.0%

40-44 0.6 14.3% 0 0.0% -100.0%

45-49 0.4 9.5% 0 0.0% -100.0%

50-54 0.2 4.8% 1 33.3% 400.0%

55-59 0.2 4.8% 0 0.0% -100.0%

60+ 0.6 14.3% 0 0.0% -100.0%

Total 4.2 3 -28.6%

Table H.2 Number of HIV notifications in the NT by sex, Jan-Mar, 2015

Sex

Female

^2.0 ^47.6% ⁰ ^0.0% ^-100.0%

Male

3.4 81.0% 3 100.0% -11.8%

Total 4.2 3

-28.6%

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Table H.3 Number of HIV notifications in the NT by Aboriginal status, Jan-Mar, 2015

Aboriginal status

Aboriginal

^0.4 ^9.5% ⁰ ^0.0% ^-100.0%

Non-Aboriginal

3.8 90.5% 3 100.0% -21.1%

Total 4.2 3 -28.6%

Table H.4 Number of HIV notifications in the NT by district, Jan-Mar, 2015

District

Alice Springs Urban

0.4 9.5% 1 33.3%

^150.0%

Darwin Urban

3.6 85.7% 2 66.7%

-44.4%

East Arnhem

0.2 4.8% 0 0.0%

-100.0%

Total 4.2 3

-28.6%

Table H.5 Number of HIV notifications in the NT by exposure category, Jan-Mar, 2015

Exposure category

quarter (2010-2014) Jan-Mar 2015 Number Proportion Number Proportion

Heterosexual 2.2 10.5% 0 -

Men who have sex with men 1.6 7.6% 3 100%

Other exposure 0.2 1.0% 0 -

Undetermined 0.2 1.0% 0 -

Total 4.2 3

 None of the three cases notified in this quarter acquired the infection within

the NT. One of them was previously notified in other jurisdiction, one arrived

in Australia from overseas with the infection, and one acquired the infection

while travelling overseas.

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I. Readers’ responses

The SHBBVU is very interested in readers’ responses to this report. Please forward any comments or suggestions to:

Surveillance Project Officer Head of Sexual Health and BBV Unit

Jiunn-Yih Su Dr Matthew Thalanany

Sexual Health and BBV Unit, Centre for Disease Control Department of Health PO Box 40596, Casuarina Northern Territory, 0811 Phone: (08) 8922 7737 Fax: (08) 8922 8809

Email: [email protected], [email protected]

All data in this report are provisional and subject to future revision.

This report is downloadable in PDF and RTF formats from the following website:

http://www.health.nt.gov.au/Centre_for_Disease_Control/Publications/Sexual_Health _Surveillance_Updates/index.aspx

Suggested citation:

Northern Territory Department of Health. Surveillance Update for Notifiable Sexually Transmitted Infections and Blood-Borne Viruses in the Northern Territory. 2015; Vol.

16, No. 1.