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Rashes: Time of appearance, after onset of fever

Submitted by jyo on Wed, 15/10/2008 - 22:13
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"Really Sick Children Must Try Duck Eggs!"

Appearance of rash in a febrile patient,

  • 1st day:   Rubella
  • 2nd day: Scarlet fever/ Smallpox
  • 3rd day: Chickenpox (1- 5 days)
  • 4th day: Measles (Koplik spots seen a day prior to the rash)
  • 5th day: Typhus & rickettsia (this is variable)
  • 6th day: Dengue (Morbilliform, over dorsum of hands and feet; trunk)
  • 7th day: Enteric fever (Rose spots over abdomen, flanks and back)

This mnemonic for exanthematous fevers is based on the average time of appearance of skin rashes, after the onset of fever.

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