Biphasic anaphylaxis
Biphasic anaphylaxis is the recurrence of symptoms within 72 hours with no further exposure to the allergen. It occurs in between 1–20% of cases depending on the study examined. This can result from morphine, radiocontrast, aspirin and muscle relaxants.
Active anaphylaxis
Active anaphylaxis is what is naturally observed. Two weeks or so after an animal, including humans, is exposed to certain allergens, active anaphylaxis (which is simply called "anaphylaxis") would be elicited upon exposure to the same allergens.
Passive anaphylaxis
Passive anaphylaxis is induced in native animals which receive transfer of the serum experimentally from sensitized animals with certain allergens. Passive anaphylaxis would be provoked in the recipient animals after exposure to the same allergens.
Further Reading
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"Anaphylaxis"
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