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As the air rushes past the glottis, which is still partially closed, a sound recalling the whoop of pertussis is heard. Often this recurs throughout all the burst of crying which follows, and each inspiration is accompanied by a shrill stridulous sound. With the re-establishment of respiration the cyanosis rapidly fades, to be succeeded in some cases by pallor and perspiration.
Hicks speaks of a child of ten months suffering with a severe cough resembling pertussis, whose lung ruptured about two weeks after the beginning of the cough, causing death on the second day. Ferrari relates a curious case of rupture of the lung from deep inspiration.
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