Seattle, British. Heterosexual HIV-infected person will transmit the virus to their partners an average of 900 times the one time of unprotected sex. Similarly, according to a study conducted in Africa.

“However, what is certainly the possibility of sexual intercourse can transmit the virus vary in the amount of virus contained in the blood of an infected person,” said the researcher, James Hughes of the University of Washington in Seattle.

The amount of virus in the blood is the most important factor in determining whether HIV is transmitted from the partner or not. In each ten-fold increase in the concentration of virus, there is increased risk of transmission of approximately three-fold in all sexual relations.

“The person whose blood contains high concentrations of virus actually only need to have sex as much as 10 times to transmit the virus,” added Hughes as reported Myhealthnewsdaily.com, Friday (13/01/2012).

The new findings reinforce the idea that the best way to reduce HIV transmission is to reduce the concentration of virus in the blood, such as antiretroviral drugs that can be done. A study published in 2011 found that the drugs can reduce HIV transmission between sexual partners by 96 percent.

This study also confirmed that condoms are highly effective in preventing HIV infection. Condoms reduce the risk of HIV transmission by 78 percent. Male circumcision can reduce HIV transmission risk by 47 percent.

This study analyzed data from 3297 pairs of sub-Saharan Africa who have ‘HIV-discordant couples‘, meaning that one partner has HIV, but others do not.

HIV-infected people are tested regularly for two years to determine the amount of HIV in their blood. Uninfected partners were also interviewed each month and asked how many times they had sex, and whether they are using security.

Uninfected partners tested periodically to see if they had contracted HIV. The researchers used genetic tests to confirm whether the virus every new HIV infections are transmitted from a spouse who recorded at baseline. A total of eighty-six HIV transmission occurred during the study period.

Men are twice as likely to transmit HIV to women. The high risk of transmission can be attributed to the concentration of virus in the blood of men higher than women. But women are more likely to have genital herpes increases HIV vulnerability.

93 percent of sexual relations in the study using a condom, but researchers suspect the recognition of study participants are greatly exaggerated. Therefore, the researchers speculate that the effectiveness of condoms to prevent HIV transmission could be more than 78 percent as predicted.

“Average Risk of HIV infection per sexual act which is estimated in this study are consistent with what previous research has found,” said Dr. Myron Cohen, professor of medicine, microbiology, immunology and public health at the University of North Carolina at Chapel Hill.

“Most of the findings may be generalizable to other countries. Previous research in the United States found the rate of HIV transmission is lower. In addition, these findings apply only to heterosexual couples, not men who have sex with men. Group homosexuals tend have HIV infection rates are higher, “added Hughes.

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