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.
Abdominal cramps, diarrhea with blood or mucus, loss of appetite, painful bowel movements, and fever, are some symptoms of this infection. Severe diarrhea can even lead to dehydration.Severe cases of shigellosis can lead to headaches, stiff neck, and convulsions.hen the intestinal infection is caused by bacteria, it is termed as a bacterial intestinal infection or bacterial gastroenteritis. The pathogenic bacteria invades the intestines and causes inflammation. It enters the human body through the intake of contaminated food, water, and undercooked meat.