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.
Tension pneumothorax: The most serious type of pneumothorax, this occurs when the pressure in the pleural space is greater than the atmospheric pressure, either because air becomes trapped in the pleural space or because the entering air is from a positive-pressure mechanical ventilator.
There is no clear cause for a spontaneous pneumothorax. It may occur when an air pocket in the lung breaks open. This allows air to leak out and become trapped in the pleural space. Air may also enter the pleural space if your lung tissue is damaged.