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 and Dysentery. Regardless of how it happens, consuming Shigella usually leads to the development of illness. Shigellosis is a food infection caused by bacteria of the genus Shigella. Remember, in a food infection, the symptoms are a result of actively growing bacteria in the host's body.Shigella is noteworthy here because a person only needs to consume a few cells, as few as 10 to 200, for the infection to develop.egardless of how it happens, consuming Shigella usually leads to the development of illness. Shigellosis is a food infection caused by bacteria of the genus Shigella. Remember, in a food infection, the symptoms are a result of actively growing bacteria in the host's body.