as patients may think? KSSG, St. Gallen, Switzerland

Transcription

1 HIV in Semen - Is it as infectious as patients may think? Pietro L Vernazza Pietro L. Vernazza, KSSG, St. Gallen, Switzerland

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3 Heterosexual Transmission HIV-pos. HIV-neg. Clumeck N, et al, NEJM, 1989;321:1460

4 Is it as infectious as patients may think What do you think? What is your estimate of transmission risk after one single sexual act A) in the absence of treatment B) during fully supressive HAART 100% - 10% - 1% - 1:10 3-1:10 4-1:10 5-1:10 6

5 PHI Transmission couple 22 y/o woman AUG y/o man log 10 /ml or Ejac. HIV-RNA Blood plasma Seminal plasma Seminal cells (DNA) HIV-Ag C.trach.-PCR AZT+3TC+ABC+APV AZM

6 Transmission risk per sex contact Partner studies Anonymous contact 1-9% partner pos. <0.3% per contact 3.1% - 8.2% 9-18% partner pos 0.3% per contact Padian, JAMA 1987 De Vincenzi, NEJM 1994 Mastro, AIDS 1994 Nicolosi, Epidemilogy 1994 Cameron, Lancet 1989

7 Risk after single sexual exposure 422 customers of Kenyan prostitutes 293 HIV-neg, prospectively followed 12% s/c rate in 12 wk period Non circumcision: OR 8.2 (3-23) GUD OR 4.7 (1.3-17) 73 men: only one single contact 8.2% s/c rate (6/73), 43% of uncircumcised Cameron et al, 1989, Lancet ii:403-7

8 Mastro study, Thailand 1115 military conscripts (21y) 6.9% HIV-pos (n=77) Sex with female prostitutes mathematical modelling: risk after single contact: 3.1% ( ) adjusted for random error in self reported frequency of contact: 5.6% ( %) Risk signif. higher in men reporting Hx of STD Mastro et al, 1994, Lancet 343:204-7

9 Sexual Transmission of HIV Risk of transmission enhanced with: Low CD4 counts Symptomatic disease High blood viral load Genital inflammation PHI r =

10 VL and HIV-Transmission-Risk i 30 Rakai (Uganda) 453 HIV-disc. couples 11.6 % TR / year % partners infecte ed < '000- > '000 50'000 HIV-RNA load (cp/ml) Quinn, NEJM, 2000; 342:921-9.

11 HIV-Primary Infection HIV-RNA in blood and semen IV-RNA (log 10 cp p/ml) Blood H r = 0.80 P < Group BL - PHI 3 Early PHI 2 Late PHI Seminal plasma HIV-RNA (log 10 cp/ml) Vernazza, 2000, Quest-Study Group

12 HIV in semen & risk per coital act Chakraborty et al. AIDS 2001,15: 621-7

13 Primary HIV Infection Marked increase of transmission i risk 0.05 isk ct ssion r xual ac nsmis er sex Tra p Weeks after infection Pilcher et al JID 2004; 189:

14 Brenner et al, JID 2007; 195:

15 Summary 1 HIV in genital tract follows blood VL Transmission risk high during PHI Q: What is the effect of treatment

16 HIV in semen under HIV therapy >1 log drop <0.5 log drop Vernazza P. et al, AIDS, 1997;11:

17 HIV V-RNA (lo og 10 cp/ml l) Viral load in blood vs. semen during the course of treatment t t in PHI g 10 c/ejac c) HIV- V-DNA (lo 8 RNA blood 7 RNA seminal fluid DNA seminal cells N=32 N=22 N=22 N=39 Baseline Early Late Acute & Primary HIV Infection CAD

18 HIV in Semen during HAART patient ts (%) with pos s. n seme n HIV dete ection i 100% 80% 60% 40% 20% 6 Pat.2: Pat.1: D4T+SQV+RTV DDI+D4T+HU 6 5 p< semen No Therapy (control) HAART, RNA<400 blood BL Wk 78 n=55 n=114 0% HIV-RNA HIV-DNA Vernazza et al., AIDS, 2000; 14:117-21

19 HIV in Semen during HAART patient ts (%) with pos s. n seme HIV dete ection i 100% nno Therapy (control) HAART, RNA<400 80% p< % p= % 20% n=55 n=114 0% HIV-RNA HIV-DNA Vernazza et al., AIDS, 2000; 14:117-21

20 Zhu et al. Transmitted HIV in semen Zhu et al, 1996, JVirol

21 Cell-free vs. Cell-associated trm Long et al, Nat Med, 2000; 6:71-5

22 HIV diversity develops over time 6 mt time infection

23 HIV diversity in early infection Men: 1 pattern <5% diversity: homogenous oge ous pattern Women: 2 patterns homogenous pattern heterogenous pattern

24 Potential hypotheses Infected by different partners Similar # sex acts / wk Similar fraction with single partner Phylogenetic clustering Differences in immune response 5/6 w already heterogenous before s/c Difference in transmitted virus

25 Hypothesis Sex. Trsm of HIV = rare event 1 hit One single hit could be Free virus HIV-infected cell Multiple strains Cell-associated

26 HIV-diversity, STDs and DNA 156 female sex workers, Kenya 89 heterogenous, 67 homogenous viral strain Sagar, AIDS, 2004;18:615-9

27 QUEST: HIV-RNA in semen during tx HIV- RNA (log 10 cp/m ml) Plasma RNA 7 Semen RNA # Days on Therapy

28 QUEST: HIV-DNA in semen during tx g 10 /Ejac c.) HIV- -DNA (lo Plasma RNA Viral DNA / ejaculate # Days on Therapy

29 Malawi urethritis project: HIV-RNA in semen log 10 HIV- V-1 RNA co opies/ml BL Wk2 BL Wk1 Wk2 BL Wk1 Wk2 BL Wk1 Wk2 Dermatology Urethritis GC NGU Cohen et al, Lancet 1997; 349:

30 HIV-Infectiousness I over time PHI STDs Infectiousness (arbritrary scale) Weeks Months / Years

31 Urethritis during HAART (n=24) Plasma HIV-RNA Semen HIV-RNA 2 / 20 positive 20 (low level) / 4 positive (high level) Sadiq et al, AIDS 2002;16:219-25

32 HAART: Latent t HIV in seminal cells 28 men 60 Supressive HAART 50 PBMC and SC Viral growth 2-LTR-circular DNA itive % pos Viral Cx PBMC 2-LTR-circ DNA Seminal Cells Nunnari G. et al, AIDS, 2002; 16:39-45

33 Decline in infectivity* w. HAART HIV incidence in SF-MSM during Infectivity* * per-partnership probability of trx from HIV+ partner from HIV+ partner - 60% Porco et al, AIDS 2004, 18:81 88

34 Literature Review Case reports of trsm under HAART

35 Artificial Insemination in HIV- discordant d couples(kssg) Experiences until Couples counselled 72 Inseminations started 43 (60%) Total Inseminations 145 Insem/couple: Median 3 (1-16) Pregnancies 17 12% of all Cycles 40% of all couples

36 HIV und Kinderwunsch Retrospective analysis Semprini: 500 couples contacted t after counselling Half of couples had conceived natrually 1 woman was HIV-infected Is our intervention missing it s target? Vernazza et al, AIDS , S

37 HIV-discordant couples in Insemination Program HIV-RNA in semen Are we reducing a zero Risk? 68 Chakraborty et al. AIDS 2001,15: 621-7

38 HAART und Transmissionsrisiko Biologische Daten: Risiko reduziert HAART: Ø Transmission dokumentiert Epid. Studien Fallserien z.b. Barroso, JAIDS

39 License to Love Counselling of HIV-d/c couples 1. Information of both partner about transmission risks 2. Rule out asymptomatic STDs 3. Maintain i fully suppressive HAART 4. Timing of unprotected intercourse (LH-urine test) 5. HIV-Pre-Exposure Prophylaxis (TDF)

40 License to Love Pregnancy-rates rates in first 21 couples 100% 25 80% Couples Preg.Rate 20 Pregna ancy Rate (c cumm.) 60% 40% 20% Num mber of cou uples 0% >10 Number of Cycles