exists and is an alternate of . The sperm that reach the egg swim into it and attempt to penetrate the zona pelluca, which is the semi permeable outer membrane of the egg. Some sperm have a shape which makes this relatively easy, and others which are poorly formed are likely to have more difficulty.
1 Shigellosis is an infectious disease caused by a group of bacteria called Shigella. 2  Symptoms of Shigella infection include diarrhea (often bloody), fever, and stomach cramps starting a day or two after exposure to the bacteria. 3  Shigellosis usually resolves in 5 to 7 days.
These people can have 10 to 30 bowel movements each day, along with a persistent urge to have a bowel movement. Rarely, Shigella bacteria can affect other parts of the body far from the digestive tract. When this happens, there may be a rash, joint pain, confusion and/or kidney failure.