Listeria. Listeria is a bacterium that causes a serious infection called listeriosis. Around 300 deaths are caused by Listeria infection each year, according to estimates from a 2011 CDC report. Listeria bacteria are most commonly found in raw foods. Vegetables can be contaminated by soil and water carrying bacteria.
Human male reproductive system. The scrotum is the bag that holds the testicles (commonly called balls) in male mammals. It is made of skin and muscle and is found between the penis and anus. It is often covered in pubic hair and becomes tight when the male is aroused.
The male's body generates sperm which is necessary for creation to occur. Sperm are produced in the male's testes. The testes are located in the scrotum which is a sac that supports them. Testes normally descend before birth, but in instances when they don't, the risk of infertility is present. The testicles are organs that are oval in shape and lie in the scrotum.