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.
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.