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 a gram-negative bacteria that is found in toilet bowls. The bacteria can cause a wide range of symptoms, including severe diarrhea and dysentery. The bacteria cause inflammation of the intestines and are usually passed in fecal matter. According to Merck online, one of the common ways that shigellosis bacteria are spread is when food workers fail to wash their hands after using the toilet.