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.
1 Pleural effusion: Accumulation of fluid in the space outside the lungs but inside the chest cavity (pleural space) can press on the airways, causing collapse.  Pneumothorax: Certain lung procedures or injuries to the chest cause air to leak into pleural space.