Anal bacteria

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A number of presentations at the HIV Research for Prevention Conference HIVR4P in Chicago looked at the influence vaginal bacteria have on HIV susceptibility, and one presentation found that vaginal bacteria may have profound effects on the levels of certain drugs used as microbicides — but not on others. A poster at the conference also looked at the bacteria in the rectum in gay men and found a correlation between having had condomless anal sex and changes in the predominant bacterial species that may similarly increase susceptibility to HIV infection. Bacterial vaginosis is a condition in which acid-loving aerobic oxygen-using bacteria such as Lactobacillus are largely replaced by species such as Gardnerella which are anaerobic. It has for a number of years been associated both with higher rates of HIV acquisition and transmission in women. Other studies have suggested that it is not so much that the anaerobic bacteria are inflammatory but that Lactobacillus is protective. In surveys of women from Africa, they only comprised about one-third, with about two-thirds various anaerobic species, especially Gardnerella and Prevotella.
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Does anal sex have any health risks?

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Perianal streptococcal cellulitis: MedlinePlus Medical Encyclopedia

Prostatitis is inflammation of the prostate gland. This problem can be caused by an infection with bacteria. However, this is not a common cause. Ongoing irritation of the prostate that is not caused by bacteria is called chronic nonbacterial prostatitis.
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What are the risks of anal sex?

Back to Sexual health. Penetrative anal sex has a higher risk of spreading STIs than many other types of sexual activity. This is because the lining of the anus is thin and can be easily damaged, which makes it more vulnerable to infection. Use a water-based lubricant, which is available from pharmacies.
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Top of the page Check Your Symptoms. Rectal problems are common. Almost everyone will experience some rectal itching, pain, or bleeding at some time during his or her life.
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