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.
Shigellosis is an infectious disease caused by a group of bacteria called Shigella. These bacteria are commonplace in Canada, and live in the intestines of infected persons.Shigellosis is a common cause of diarrhea, including bloody diarrhea.eople who eat food or drink water contaminated with Shigella bacteria can become ill with shigellosis. The illness is highly infectious and can also be spread from person to person. The disease is usually spread through direct or indirect fecal-oral contact. This happens when.