Bacterial respiratory infections are thought to be acquired through the inhalation of fine droplets from the mouth and throat into the lungs. These droplets contain germs that can breed and multiply within the lungs to cause damage. Recent research suggests that bacteria found in the throat as well as bacteria found in the mouth can be drawn into the lower respiratory tract, causing infections or worsening existing lung conditions. People with respiratory diseases, such as chronic obstructive pulmonary disease, typically suffer from reduced protective systems, making it difficult to eliminate bacteria from the lungs.
Scientists have found that bacteria that grow in the oral cavity can be inhaled into the lungs to cause respiratory diseases such as pneumonia, especially in people with periodontal disease. This discovery leads researchers to believe that these respiratory bacteria can travel from the oral cavity into the lungs to cause infection.
