HomeAbout SeronoContact UsGlossaryReferencesSearchSite Guide
			Concern Treatment Pregnancy Experiences Concern Evaluating Your Fertility Understanding Fertility Maximise Your Fertility Infertility: An Introduction Infertility in Females Infertility in Males Sperm Disorders Absence of Sperm Reduced Sperm Sperm Abnormalities Antisperm Antibodies Anatomical Implications of Infertility Questions to Ask Your Doctor		Sperm Disorders The major cause of male infertility is failure to produce enough healthy sperm. Azoospermia (complete absence of sperm in the semen) and oligospermia (in which too few sperm are produced) both cause infertility.  It is important to note here that, although only one sperm is required for fertilisation, enzymes from many sperms are required to break down the protective tissues around the ovum and so allow the fertilising sperm to penetrate into the cytoplasm of the ovum..
			© 2003-2005 Serono S.A. Please read our Legal Statement. US residents should consult the Serono, Inc. fertility website at www.fertilitylifelines.com