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.
However, a single small bleb or even several small blebs may be asymptomatic and usually are not serious, so no treatment is indicated. Large blebs may rupture more frequently leading to pnemothorax or a collection of air in the pleural cavity outside the lung. Pnemothorax can cause pressure over the lung leading to lung collapse and difficulty in breathing.