Schistosomiasis (bilharziasis) is a major human disease caused by three species of the genus Schistosoma, known collectively as blood flukes. Africa and western Asia (e.g., Iran, Iraq) are endemic centres for S. haematobium; S. mansoni also is found in these areas, as well as inâ¦
How Alcohol Damages Sperm. Alcohol can reduce the quantity of sperm a man produces (his sperm count) and the quality of that sperm. One way in which alcohol does this is by preventing the body from absorbing zinc in the normal way. Zinc is found in high quantities in sperm.
These can damage sperm cells and deplete their stores as well. By affecting the spermâs DNA, smoking can also affect the babyâs growth and increase risk of cancers. This study clearly showed that smoking has an adverse effect on the quality and quantity of sperm cells in the male reproductive system.