The second reaction can happen within 72 hours of the first. Protracted anaphylaxis: This type of anaphylaxis is relatively rare. The reaction can last for days or even weeks without fully resolving.

A biphasic anaphylactic reaction involves a recurrence of symptoms after the initial symptoms of anaphylaxis have been treated and subsided. A second reaction can occur up to 72 hours after the first.

Starting with the basic assumption of no saturation or hysteresis, and with distribution of armature phase m. m. f. effectively sinusoidal as far as regards phenomena dependent upon rotor position, ...