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.
Air takes up space, restricting lung expansion. Partial or complete collapse of the affected lung. Spontaneous: an air-filled blister on the lung ruptures. Traumatic: air enters through chest injuries. Tension: air enters pleural cavity through the wound on inhalation but cannot leave on exhalation. Open: air enters pleural cavity through the wound on inhalation and leaves on exhalation.