Bacterial diseases are illnesses caused by harmful bacteria, which are tiny single-celled organisms. These diseases can affect various parts of the body and may lead to symptoms like fever, pain, and fatigue. Common bacterial diseases include strep throat, tuberculosis, and bacterial pneumonia. Bacteria can spread through different means, such as contaminated food, water, or direct contact with an infected person. Treatment often involves antibiotics, which are medications designed to kill or inhibit the growth of bacteria. However, some bacteria have become resistant to antibiotics, making prevention and proper hygiene essential in controlling these diseases.