The common cold is a viral infectious disease that infects the upper respiratory system. It is also known as acute viral rhinopharyngitis, or acute coryza. Being the most common infectious disease in humans, the cold is mainly caused by coronaviruses or rhinoviruses.
If you have bacterial gastroenteritis, bacteria have caused an infection in your gut. This usually results in your stomach and intestines becoming inflamed, and youâll probably experience unpleasant symptoms such as vomiting, severe abdominal cramps and diarrhea.umerous kinds of bacteria can cause gastroenteritis, including: 1  yersinia (found in pork). 2  staphylococcus (found in dairy products, meat, and eggs). 3  shigella (associated with water and found in swimming pools). 4  salmonella (found in meat, dairy products, and eggs).
Inflammation can be caused by acid from the stomach or by infection. The most common cause of infection is the bacteria H. pylori. When the stomach gets infected with this bacteria, it can cause problems like gastritis (irritation of the stomach) and ulcers.Copyright 2011 Association of Directors of Anatomic and Surgical Pathology, adapted with permission by the American Cancer Society.he most common cause of infection is the bacteria H. pylori. When the stomach gets infected with this bacteria, it can cause problems like gastritis (irritation of the stomach) and ulcers. Copyright 2011 Association of Directors of Anatomic and Surgical Pathology, adapted with permission by the American Cancer Society.