Acute pneumonia: infection or inflammation in the lung?

The question in the title of this letter is not a comparison of terms. The answer to this question is fundamental to substantiate the principles of care and further results of treatment of the disease. The choice of the answer to this dilemma determines the strategy for further directions in solving the problem of acute pneumonia (AP). The validity and correctness of this choice will affect not only the effectiveness of further actions and efforts, but also the fate of many patients. To come to a meaningful and reasoned view of the essence of AP, it is enough to analyze the arguments and facts accumulated by medical science and practice.