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).
Helicobacter pylori (H pylori) is the name of a bacteria that can cause peptic ulcers. It can infect the stomach lining, dissolving the mucus film that protects it from the highly acidic stomach contents. This causes a burning pain in the stomach. Helicobacter pylori is the most common human bacterial infection. Most infections occur before age five. H. pylori infection is a common cause of peptic ulcer disease in the United States. Peptic ulcer is a localized area of erosion occurring in the stomach or duodenal (the beginning of the small intestine) lining, resulting in abdominal pain, possible bleeding, and other gastrointestinal symptoms.