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Modern aspects of infertility treatment.

New techniques give promise in the management of infertility. In the UK, a decade of experimentation with in vitro fertilization and embryo transfer has met with some success, and given encouragement to other workers. The most important change in this technique appears to have been to utilize only spontaneous ovulation and to transfer the fertilized ovum at night. Artificial donor insemination using frozen sperm is attaining a success rate of up to 66 percent after six cycles of insemination.