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.
In these cases, the pneumothorax occurs because the diseased lung tissue is next to the pleural space. Secondary spontaneous pneumothorax can be more severe and even life-threatening because diseased tissue may open a wider hole, allowing more air into the pleural space than does a small, ruptured bleb.