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Table 2 Number of cases and grade of malaria infection diagnosed at the hospital, Santo Antδnio, Príncipe, according to residence of the patient. (Grade 1 = 1–100 Grade 2 101–200; Grade 3 201–400; Grade 4 >400 parasites per 100 fields)

From: Malaria and its possible control on the island of Príncipe

Locality   P. falciparum Grade Proportion by grade P. malariae
Neg 1 2 3 4 1 2 3 4
Beach 67 62 39 18 17 0.46 0.29 0.13 0.13 7
Interior 482 350 169 56 33 0.58 0.28 0.09 0.05 22
Roça 395 302 120 53 65 0.56 0.22 0.10 0.12 14
Town 1403 864 305 101 52 0.65 0.23 0.08 0.04 34
Unknown 334 243 108 46 32 0.57 0.25 0.11 0.07 21