Relapse
Relapse is the return of a disease after its apparent cessation.
Both P. vivax and P. ovale have a tendency to relapse after resolution of the primary infection. Relapses occur weeks or months after the primary infection.
Recrudescence
Recrudescence is the recurrence of symptoms after a temporary abatement. The chief distinction between a recrudescence and a relapse is the time interval, a recrudescence occuring after some days or weeks, a relapse after some weeks or months.

P. falciparum is the usual cause of recrudescent infections and these arise 2-4 weeks following treatment.

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