Empyema, Pleural

The goal of this clinical trial is to find out if giving certain medications once a day works just as well as giving them twice a day to treat infections around the lungs (called pleural infections). These medications-tissue plasminogen activator (tPA) and deoxyribonuclease (DNase)-are placed through a chest tube into the space between the lung and the chest wall to help clear out the infection. The investigators are trying to learn: * Does using the medicine once a day work just as well as using it twice a day? * Are there any differences in outcomes between patients who get the medicine once a day versus twice a day? * Does more or less fluid remain in the chest (seen on a chest x-ray) depending on how often the medicine is given? Participants will: * Have an infection around their lung and will already be getting normal hospital care, including a chest tube to drain the infected fluid around their lung. * Be asked to give permission to join the study. * Be randomly chosen (like flipping a coin) to get the medications either once a day or twice a day through the chest tube.

The goal of this observational study is to learn if saline results in improvement for patients with infection of their plerual space. The main question it aims to answer is: What is the time to chest tube removal? Do these patients after need to escalate to fibrinolytics? Do these patients after need to escalate to surgery? Participants will: * Receive receive saline into their pleural space through an existing chest tube * If they fail to improve, which will be determined by fluid size after treatment or signs of persistent infection, they will receive fibrynolytics through an existing chest tube * If they fail to improve, which will be determined by fluid size after treatment or signs of persistent infection, they will be referred to surgery.

Infections of the pleural space are common, and patients require antibiotics and chest drain placement to evacuate the chest from the infected fluid. Chest drains can get blocked by the drainage fluid and material. For this reason, it is thought that flushing the chest drain with saline solution, can help maintain the patency of the tube. This proposed study will evaluate the impact of regular chest drain flushing on the length of time to chest tube removal and total hospitalization as well as improvement in chest imaging and the need for additional interventions on the infected space.

This retrospective observational study aims to evaluate clinical course of complicated community acquired pneumonia in children, particularly focusing on necrotizing pneumonia cases, as well as determination of etiological agents (viruses and bacteria) and its association to severity and outcomes of the disease. Furthermore, therapeutic approach, complications, short-term and long-term outcomes and the prevention of the disease are to be assessed. The study will encompass data from pediatric centers in the South-East Europe willing to participate in the study, encompassing ten-year period of time.