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.
The rupture of an air sac in the outside of the lung may only cause pleurisy for a few days. But if a hidden pneumonia was the cause of the rupture, it may last much longer. And chronically diseased lungs, most commonly due to smoking, may rupture repeatedly and cause pleurisy to return again and again.