Rashes: Time of appearance, after onset of fever
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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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Previous infection with a dengue fever virus increases your risk of a more severe form of the disease. This is especially true for children. If you've had dengue fever before, you can get it again if you become infected with another one of the four dengue-causing viruses.