The genome of the organism that produces the world's most lethal toxin has been revealed. This toxin is the major weapon in the genome of Clostridium botulinum: less than two kg is enough to kill every person on the planet.
pneumothorax. entry of air into the pleural cavity in sufficient quantity to cause collapse of the lung and consequent respiratory embarrassment. If it is unilateral there is a mediastinal shift with displacement of the heart to the other side of the chest. Breath sounds are absent from the affected side. Pneumothorax.
Trauma, disease, or surgery can interrupt the closed negative-pressure system of the lungs, causing the lung to collapse. Air or fluid may leak into the pleural cavity. A chest tube is inserted and a closed chest drainage system is attached to promote drainage of air and fluid.