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.
Shigella gastroenteritis is a bowel infection caused by bacteria from the Shigella family. Other names for shigella gastroenteritis include shigellosis, Shigella infection, Shigella enteritis and bacillary dysentery. Common symptoms include diarrhoea that may contain blood, mucus or pus, abdominal cramps, nausea and vomiting. Shigella bacteria are excreted in faeces (poo), so an infected person who doesnât wash their hands properly after going to the toilet can spread the bacteria to other people, objects, surfaces and food.