Final answer:
The likely diagnosis based on the given symptoms is pneumonia, which is an infection causing inflammation and fluid-filled pockets in the lung. These symptoms are consistent with the findings of dullness, midline trachea, bronchial breath sounds, late expiratory crackles, and increased fremitus over the affected area. The diagnosis can be confirmed through a chest radiograph and analysis of sputum samples.
Step-by-step explanation:
The given symptoms such as "dullness over the affected area," "midline trachea," "bronchial breath sounds over the affected area," "late expiratory crackles," and "increased fremitus over the affected area" are suggestive of a lung infection known as pneumonia. Pneumonia is an inflammation of the lung tissue caused by an infection, typically bacteria or viruses. The symptoms described indicate that the infection has resulted in consolidation and fluid-filled pockets in the lung, which can be seen on a chest radiograph. The crackling sound heard during auscultation and the presence of abnormal mucus in the sputum sample further support this diagnosis.