Scientists believe they could be a step closer to developing a new way of stopping the transmission of HIV without using condoms. Researchers from the US and Britain found for the first time that a microbicide - a chemical that kills microorganisms - can block the spread of the virus which can lead to Aids. The research - published in the Journal Nature Medicine - could eventually benefit women whose partners refuse to use condoms. Recent figures show that women are being hit hardest by the HIV epidemic, with the number of women infected with the virus increasing steadily worldwide. The microbicides - possibly in the form of gels, foam sponges or pessaries - could be used by women before sexual intercourse.

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