A condition of suboptimal concentration of SPERMATOZOA in the ejaculated SEMEN to ensure successful FERTILIZATION of an OVUM. In humans, oligospermia is defined as a sperm count below 20 million per milliliter semen. (Experimental Factor Ontology, EFO_0000279)
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24 genes associated with the disease azoospermia in GWAS and other genetic association datasets from the GAD Gene-Disease Associations dataset.