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All Rights Reserved. Terms of use and Your privacy. Illustration by Liz Defrain. Can you get HIV from oral sex? Americans really want to know their HIV risk during fellatio—even more so than during anal sex.

Sure, you can Google the subject, but the results may further confuse and scare you. The AIDS. Numbers seem less abstract, more specific. But do they give us a better understanding of HIV risk and sexual health? Probabilities of HIV transmission per exposure to the virus are usually expressed in percentages or as odds see chart at the end of this article.

For example, the average risk of contracting HIV through sharing a needle one time with an HIV-positive drug user is 0. The risk from giving a blowjob to an HIV-positive man not on treatment is at most 1 in 2, or 0. The risk of contracting HIV during vaginal penetration, for a woman in the United States, is 1 per 1, exposures or 0. As for anal sex, the most risky sex act in terms of HIV transmission, if an HIV-negative top—the insertive partner—and an HIV-positive bottom have unprotected sex, the chances of the top contracting the virus from a single encounter are 1 in or 0.

Specifically, it is 1. If the guy pulls out before ejaculation, then the odds are 1 out of Say what? Is HIV really this hard to transmit, especially in light of the alarming statistics we are bombarded with? Although the CDC estimates that nearly 1. And before you even think it: No, the answer is not that everyone with HIV is a ginormous slut who has never heard of safer sex. For starters, you have to understand that these probabilities of HIV transmission per single exposure are averages.

They are general ballpark figures that do not reflect the many factors that can raise and lower risk. One such factor is acute infection, the period of six to 12 weeks after contracting the virus. So right there, the per-act risk of receptive vaginal transmission jumps from 1 out of 1, exposures to 1 out of 50 exposures, and the risk of receptive anal sex goes from 1 out of 70 to higher than 1 out of 3. Vaginal conditions such as bacterial vaginosis, dryness and menstruation also alter risk.

But they can be a good tool for understanding risk. Other factors lower risk. Circumcision does so an average of 60 percent for heterosexual men.

HIV-negative people can take a daily Truvada pill as pre-exposure prophylaxis, or PrEP, to lower their risk by 92 percent; similarly, there is post-exposure prophylaxis, or PEP.

And the CDC says condoms lower risk about 80 percent. Of course, these numbers will vary based on correct and consistent use of the prevention strategy. Researchers also view risk through the constructs of family, relationships, community and socioeconomic status. Then there is the concept of cumulative risk. The oft-cited numbers for the risk of HIV transmission take into account one instance of exposure.

But this is not a static number. Doing so is a serious gamble. Numbers and probabilities can be miscalculated and misinterpreted. Case in point: Having a 1 in 70 chance of transmitting HIV does not mean it takes 70 exposures to the virus in order to seroconvert.

It simply means that out of 70 exposures, on average, one will lead to HIV; bad luck might have it that the transmission occurs on the very first exposure. Another important concept to grasp is absolute risk what the risk actually is versus relative risk the percent change in the risk. In this example, a 92 percent risk reduction does not mean the final absolute risk is 8 percent.

Instead, it is a 92 percent reduction of the beginning risk. If the beginning absolute risk is 50 percent, then PrEP reduces the risk to 4 percent; if the beginning risk is 20 percent, then PrEP lowers it to 1. Also, there are often research gaps, he says, meaning that in many cases, scientists might not yet have real-world examples to back up these numbers and calculations, but they do have mathematical modeling and the biological rationale for why certain ideas about HIV risk are true.

Surveys have found that more than one in five gay men in urban cities are HIV positive, and the virus is more prevalent among MSM of color and certain communities. People in these communities are more likely to come in contact with the virus even if they have fewer partners and practice safer sex more often.

Perhaps the biggest miscalculation is the incorrect assessment that you or your partner is HIV negative. But a young guy from the Midwest who looks negative? Data be damned. Often for good reason. One survey asked young MSM who cruised for sex online to list their main worries. The answers? Will Robinson! And in the real world, risk-takers are celebrated. We have to take risks every day.

Sexual health is often framed in the idea of risk instead of rewards. This may present HIV and those living with it as the worst possible outcome imaginable, he notes, which is not only stigmatizing but often irrational and false since many people with HIV are, in fact, just fine. Click here to download a copy as a PDF. You have been inactive for 60 minutes and will be logged out in. Any updates not saved will be lost. Home Basics.

Playing the HIV numbers game is less—and more—risky than you think. Copy Link. Share 30 Comments Print. Click here to read a digital edition of this article. Join The Discussion. National Hepatitis Testing Day Stay Logged In? Continue Log out. Click here to log back in.

Against All Odds: What Are Your Chances of Getting HIV in These Scenarios?

Male circumcision reduces the risk of infection with HIV-1 from female sexual partners by more than twofold, according to a study of Kenyan men published in the 15 th February edition of The Journal of Infectious Diseases. Although previous studies have found similar trends, this investigation is the first to assess the risk of transmission per sex act in an area where multiple sexual partners and a lack of male circumcision are common, and to take religious and ethnic differences into account. Although sub-Saharan Africa has a high prevalence of HIV-1 infection, the spread of the virus has not been uniform across the region. To resolve these issues, investigators from Kenya and the United States carried out a prospective study of HIV infection and sexual behaviour in a cohort of Kenyan men.

When it comes to contracting HIV, some acts are riskier than others. Here are the HIV transmission rates by type of exposure. It takes only one instance of exposure to become infected with the human immunodeficiency virus, or HIV.

This study follows up on an earlier study by the same authors examining per-act heterosexual HIV transmission probabilities. It is a systematic review and analysis of all available study data related to the likelihood of heterosexual HIV transmission. The authors reviewed 43 published studies conducted in various countries that reported per-act heterosexual HIV-1 transmission probability estimates. The authors concluded that the average male to female risk of HIV transmission is. The authors' three objectives were to provide summary estimates of HIV-1 transmission probabilities per heterosexual contact; do in-depth single variable and multivariable analysis to explore the reasons for different study results; and estimate the role of risk factors such as viral load and STIs on the likelihood of transmission.

Vaginal Sex and HIV Risk

All Rights Reserved. Terms of use and Your privacy. Illustration by Liz Defrain. Can you get HIV from oral sex? Americans really want to know their HIV risk during fellatio—even more so than during anal sex. Sure, you can Google the subject, but the results may further confuse and scare you. The AIDS.

What Are My Chances of Contracting HIV?

Human immunodeficiency virus HIV attacks and weakens the immune system, making an individual more vulnerable to serious illness. Untreated HIV can lead to AIDS , which occurs when the immune system is so weak it becomes susceptible to serious infections and some cancers. An estimated 39, people in the country were diagnosed with HIV in alone. HIV transmission occurs in many different ways, including through condomless sex and by sharing needles. Risk of transmission varies depending on several factors including:.

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During a median follow-up period of 1. No HIV transmissions occurred. The investigators concluded that the risk of HIV transmission through vaginal intercourse in these circumstances was effectively zero Rodger.

The Odds of Getting HIV, Ranked

Vaginal sex intercourse involves inserting the penis into the vagina. Some sexual activities are riskier than others for getting or transmitting HIV. Activities like oral sex, touching, and kissing carry little to no risk for getting or transmitting HIV.

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Q: What are the chances of a man being infected after condomless sex with a woman who has HIV? In general, the risk of a man getting HIV from an HIV-positive woman during vaginal intercourse in the United States is low--probably less than 1 of 1, exposures will result in actual infection. This risk may be higher depending on certain factors, such as whether the woman is having her period or whether the man is uncircumcised, and it also may be higher in poor countries. Of course, there is no risk of getting HIV from a woman unless she has HIV, so it's good to talk about this with any potential sex partner. After all, she may have the same thoughts or concerns about whether YOU have HIV, but also might not bring up the subject.

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This fact sheet describes the risk of getting HIV through vaginal sex and list ways to the lining of the vagina and cervix may allow HIV to enter her body if her male Getting tested and treated for STDs reduces a person's chances of getting or.

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