Which respiratory infection is primarily bacterial, often accompanied by phlegm in the lungs?

• A. Pneumonia
• B. Tuberculosis
• C. Asthma
• D. Chronic bronchitis

Answer: (A)

Pneumonia is primarily a bacterial infection characterized by inflammation of the air sacs in the lungs, which can fill with fluid or pus, often leading to the production of phlegm. This accumulation of fluid can impact breathing and result in symptoms such as cough, fever, chills, and difficulty breathing. In bacterial pneumonia, the pathogens primarily responsible—such as Streptococcus pneumoniae—often lead to significant mucus production, making phlegm a key feature in a patient's presentation.

While tuberculosis is also a serious respiratory infection, it is primarily caused by a bacteria called Mycobacterium tuberculosis, but it tends to result in chronic symptoms and is associated with more specific factors, like coughing up blood rather than phlegm. Asthma is an inflammatory condition of the airways that can lead to wheezing and difficulty breathing, but it is not an infection and does not typically result in bacterial involvement. Chronic bronchitis, an obstructive airway condition often due to smoking or pollution, can involve mucus production and cough, but it is primarily associated with chronic inflammation rather than a specific bacterial infection. Thus, in terms of bacterial respiratory infections with phlegm involvement, pneumonia is the most direct and relevant choice.