The definition of a possum, or opossum, is a tree-dwelling nocturnal marsupial with fur and a prehensile tail. A small Australian mammal that lives in a tree and only comes out at night is an example of a possum. possum. possum.
More than two thirds of patients who die of anaphylaxis do so within the first: half hour. ____, a harsh, high-pitched inspiratory sound, occurs when swelling in the upper airway closes off the airway; the swelling can eventually lead to total obstruction. Stridor.
Wasp or bee stings are also common causes of anaphylaxis. Additionally, exercise can trigger anaphylaxis if the activity occurs after eating allergy-provoking food. Medications are also a common cause of anaphylaxis. Pollens and other inhaled allergens (allergy-causing substances) rarely cause anaphylaxis. Some substances can cause reactions -- called anaphylactoid reactions -- that are similar to and just as serious as anaphylaxis, but do not involve immunoglobulin E antibodies.