"Really Sick Children Must Take No Exercise":
· Number of days after fever onset that a rash will appear:
1 Day: Rubella
2 Days: Scarlet fever/ Smallpox
3 Days: Chickenpox
4 Days: Measles (and see the Koplik spots one day prior to rash)
5 Days: Typhus & rickettsia (this is variable)
6 Days: Nothing
7 Days: Enteric fever (salmonella)
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