IIRC Death has previously speculated that HIV lives in the arse.
Perhaps he has a valid point. 
It's quite astonishing that 25% of this cohort have "A history of
medical or surgical treatment of the anus..."
<http://www.aidsmap.com/en/news/77507160-C7E1-4255-9407-688570D28F86.asp>:
----- Begin Quote -----
Over two-thirds of HIV-positive patients in an Australian cohort had
abnormal cells in the anus, and 84% had anal infection with strains of
human papilloma virus (HPV) that are associated with a high risk of
anal cancer, according to an Australian study published in the April
edition of Sexually Transmitted Infections. The investigators found
that infection with high risk HPV was associated with the presence of
high-grade pre-cancerous cells and pre-cancerous cells of
undetermined, but potentially high-grade, significance.
Anal cancer is a serious condition associated with high rates of
illness and death. The prevalence of anal cancer amongst gay men is
thought to be similar to that amongst women before screening for
cervical cancer was introduced (approximately 35 cases per 100,000).
Higher rates of anal cancer have been observed in HIV-positive
individuals, (but the condition is still rare in this patient group).
[...]
Studies from the US have suggested that as many as 93% of HIV-positive
gay men and 14% of HIV-positive women have abnormal cells in the anus.
[...]
A history of medical or surgical treatment of the anus was present in
25% of patients, and 18% had had anal warts removed.
Anal cytology results were available for 113 patients, and 85 (67%)
had cells which were to some extent abnormal. Most patients (106,
84%), had anal infection with a high-risk strain of HPV, and 79 (74%)
of these individuals had abnormal anal cells.
A total of 16 patients (13%) had high-grade pre-cancerous cells
changes (high-grade squamous intraepithelial lesion, HGSIL), all of
whom had anal infection with high-risk strains of HPV. Furthermore, 13
patients (10%) had cell changes of undetermined significance with
possibly high-grade changes, and 92% of these individuals had
high-risk HPV strains present.
----- End Quote -----
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<http://www.hiv-poz.co.uk/>
Moible: +447804573139
4,848 days and counting...
