Ratio of P. falciparum to P. vivax malaria cases confirmed during weeks when all patients presenting to SMRU clinics with malaria symptoms had a malaria smear, by age group.

One week each month, all patients presenting at the SMRU clinics with malaria symptoms were tested by microscopy, allowing the calculation of the ratio of P. falciparum to P. vivax infection; a ratio above 1 indicates a predominance of P. falciparum, and a ratio below 1 a predominance of P. vivax.