Normally, for a sperm to fertilize an egg, it should have a normal oval head, neck and a tail. Teratospermia or teratozoospermia is a condition characterized by the presence of large numbers of sperm with an abnormal appearance in a man’s semen. When more than 60% of the sperm have malformations, it can interfere with fertility; A normal sperm has an oval-shaped head, a well-defined cap (acrosome) that covers part of the head, and a single midpiece and tail. During the production of sperm in the testicle (which takes about 78to90 days!), defects often occur. The presence of abnormally-shaped sperm can negatively affect fertility by reducing sperm motility and/or preventing sperm from penetrating the ovum. Achieving a pregnancy may be difficult. Many infertile men have sperm samples which have low sperm counts, with poor motility and many abnormally shaped sperms. This is called oligoasthenoteratozoospermia