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.
Testosterone is most often associated with sex drive, and it plays a vital role in sperm production. But it also affects bone and muscle mass, the way men store fat in the body, and even red blood cell production. A manâs testosterone levels can also affect his mood. A drop in testosterone levels can contribute to: