Bibliography<\/a><\/li>\n<\/ul>\n<\/nav>\n\n\n\nIntroduction<\/h1>\n\n\n\n
Male infertility is a disease, syndrome, or condition of the male reproductive system that causes failure to achieve a pregnancy. The World Health Organization (WHO) defines male infertility as\u00a0\u201cthe inability of a man to impregnate a fertile woman after at least one year of frequent, unprotected sexual intercourse.\u201d It is estimated that 20-30% of infertility cases are solely due to male factors, and men contribute to 50% of infertility cases overall. The percentage of infertile men globally ranges from 2.5% to\u00a012%. Around 30 million men worldwide are infertile, with the highest rates in Africa and Central\/Eastern Europe, that can account for up to 70% of infertility\u00a0cases. In North America, male infertility rates are estimated at 4-6%, in Australia at 9%, and in Central and Eastern Europe at\u00a08-12%.