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Bacterial infections are diseases caused by dangerous bacteria that enter the body and grow in tissues or organs. They can infect practically any region of the body, such as the skin, lungs, urinary tract, digestive system, bloodstream, and neurological system. Common examples include urinary tract infections, bacterial pneumonia, TB, strep throat, skin infections and bacterial gastroenteritis.
Symptoms depend on the part affected and can be fever, chills, tiredness, soreness, swelling, redness, coughing, problems with breathing, vomiting or changes in urination. Some bacterial infections are localised, but others can spread through the bloodstream and produce significant problems such as septicaemia.
Diagnosis may include clinical examination, blood testing, urine analysis, cultures, imaging or other lab procedures. Knowing the culprit microorganism can assist healthcare workers in choosing the proper treatment. Antibiotics are frequently prescribed for bacterial infections; however, the selection of a specific antibiotic depends on factors such as the organism causing the infection, the location of the infection, the severity of the infection and the antibiotic susceptibility profile.

Treatment should be completed as indicated, and the inappropriate use of antibiotics should be avoided. Good hygiene, careful food handling, vaccination when possible, adequate wound care and quick medical attention can also decrease the incidence of bacterial infections and their sequelae.