The Anaphylaxis page has been updated to better emphasise the rarity of delayed phase anaphylaxis in ED patients and to avoid routine long periods of observation for patients with anaphylaxis otherwise improved with therapy.
van der Zwet, K. V. M., van Vossen-Treur, D., Venema, E., Guillen, S., & Moore-van Leest, E. J. (2022). Biphasic Allergic Reactions at a Dutch Emergency Department: A 5-Year Retrospective Cohort Study. J Emerg Med. https://doi.org/10.1016/j.jemermed.2022.10.013