A number of factors may be involved in the genesis of this condition, including age, infectious agents ( such as Chlamydia trachomatis), Y chromosome microdeletions, mitochondrial changes, environmental pollutants, and "subtle" hormonal changes.

https://en.wikipedia.org/wiki/Oligospermia

Due to the reduced fertilizing ability of affected spermatozoa the men suffering from OTA syndrome are frequently infertile

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