On Saturday, August 6, 2016 at 5:01:37 PM UTC+1,
michael...@gmail.com wrote:
> You seem fixated on the role of foreskin in HIV transmission. I'm wondering what this is based on. Is it the studies that were done in Africa, the same ones that WHO bangs on about?
There's a LOT more evidence than that, old sport. Dozens of studies all showing the same thing. Here's a summary I found from the US Centre for Disease Control -
International Observational Studies
Multiple cross-sectional, prospective, and ecologic
(population-level) studies have identified lack
of male circumcision as a risk factor for HIV
infection.
A systematic review and meta-analysis that
focused on heterosexual transmission of HIV in
Africa was published in 2000 [6]. It included 19
cross-sectional studies, five case-control studies,
three cohort studies, and one partner study. A
substantial protective effect of male circumcision
on risk for HIV infection was noted, along
with a reduced risk for genital ulcer disease.
After adjusting for confounding factors in the
population-based studies, the relative risk for HIV
infection was 44% lower in circumcised men. The
strongest association was seen in high-risk men,
such as patients at sexually transmitted disease
(STD) clinics, for whom the adjusted relative risk
was 71% lower for circumcised men.
A review that included stringent assessment of 10
potential confounding factors and was stratified
by study type or study population was published
in 2004 [7]. Most of the studies were from
Africa. Of the 35 observational studies included
in the review, the 16 in the general population had
inconsistent results. The one large prospective
cohort study in this group showed a significant
protective effect, with the odds of infection being
42% lower in circumcised men [8]. The remaining
nineteen studies were conducted in high-risk
populations. These found a consistent, substantial
protective effect, which increased with adjustment
for confounding. Four of these were cohort
studies: all demonstrated a protective effect, with
two being statistically significant .
Ecologic studies
Ecologic studies also indicate a strong association
between lack of male circumcision and HIV
infection at the population level. Although links
between circumcision, culture, religion, and risk
behavior may account for some of the differences
in HIV infection prevalence, the countries
in Africa and Asia with prevalence of male
circumcision of less than 20% have HIV-infection
prevalences several times higher than countries
in those regions where more than 80% of men are
circumcised [9].
International Clinical Trials
Three randomized, controlled clinical trails have
been undertaken in Africa to determine whether
circumcision of adult males will reduce their risk
for HIV infection. The study conducted in South
Africa [10], was stopped in 2005 and those in
Kenya [11] and Uganda [12] were stopped in 2006
after their interim analyses found that medical
circumcision reduced male participants’ risk of
HIV infection.
In these studies, men who had been randomly
assigned to the circumcision group had a 60%
(South Africa), 53% (Kenya), and 51% (Uganda)
lower incidence of HIV infection compared to men
assigned to the wait list group to be circumcised
at the end of the study. In all three studies, a few
men who had been assigned to be circumcised
did not undergo the procedure, and vice versa.
When the data were reanalyzed to account for
these deviations, men who had been circumcised
had a 76% (South Africa), 60% (Kenya), and
55% (Uganda) reduction in risk of HIV infection
compared to those who were not circumcised.
References
1 Fink AJ. A possible explanation for
heterosexual male infection with AIDS. N
Engl J Med. 1986 Oct 30;315(18):1167.
2 Alanis MC, Lucidi RS. Neonatal
circumcision: a review of the world’s oldest
and most controversial operation. Obstet
Gynecol Surv. 2004 May;59(5):379-95.
3 Patterson BK, Landay A, Siegel JN, Flener
Z, Pessis D, Chaviano A, et al. Susceptibility
to human immunodeficiency virus-1
infection of human foreskin and cervical
tissue grown in explant culture. Am J Pathol.
2002 Sep;161(3):867-73.
4 Szabo R, Short RV. How does male
circumcision protect against HIV infection?
BMJ. 2000 Jun 10;320(7249):1592-4.
5 Weiss HA, Thomas SL, Munabi SK, Hayes
RJ. Male circumcision and risk of syphilis,
chancroid, and genital herpes: A systematic
review and meta-analysis. Sex Transm Infect.
2006 Apr;82(2):101-9; discussion 10.
6 Weiss HA, Quigley MA, Hayes RJ. Male
circumcision and risk of HIV infection in
sub-Saharan Africa: a systematic review
and meta-analysis. AIDS. 2000 Oct
20;14(15):2361-70.
7 Siegfried N, Muller M, Volmink J, Deeks J,
Egger M, Low N, et al. Male circumcision
for prevention of heterosexual acquisition of
HIV in men. Cochrane Database Syst Rev.
2003(3):CD003362.
8 Gray RH, Kiwanuka N, Quinn TC,
Sewankambo NK, Serwadda D, Mangen FW,
et al. Male circumcision and HIV acquisition
and transmission: cohort studies in Rakai,
Uganda. Rakai Project Team. AIDS. 2000
Oct 20;14(15):2371-81.
9 Halperin DT, Bailey RC. Male circumcision
and HIV infection: 10 years and counting.
Lancet. 1999 Nov 20;354(9192):1813-5.
10 Auvert B, Taljaard D, Lagarde E, SobngwiTambekou
J, Sitta R, Puren A. Randomized,
Controlled Intervention Trial of Male
Circumcision for Reduction of HIV Infection
Risk: The ANRS 1265 Trial. PLoS Med.
2005 Nov;2(11):e298.
11 Bailey RC, Moses S, Parker CB, et al. Male
circumcision for HIV prevention in young
men in Kisumu, Kenya: a randomized
controlled trial. Lancet 2007; 369:643-656.
12 Gray RH, Kigozi G, Serwadda D, et al. Male
circumcision for HIV prevention in men in
Rakai, Uganda: a randomized trial. Lancet
2007;369:657-666.