TABLE 2.

Frequencies and median levels of IgG antibodies to P. falciparum antigens in adults in the rainy and dry seasons

AntigenRainy seasonDry season
No. of IgG positive/total no. (%)aMedian IgG level (range)bNo. of IgG positive/total no. (%)Median IgG level (range)
CSP41/71 (57.7)1.10 (0.02-4.80)46/70 (65.7)1.21 (0.31-3.77)
TRAP43/71 (60.6)1.23 (0.14-4.28)45/70 (64.3)1.20 (0.36-3.45)
LSA-128/71 (40.8)0.84 (0.11-3.81)13/70 (18.6)c0.54 (0.03-1.76)d
  • a A positive response was defined as an antibody level of ≥1.0 AU.

  • b Individual IgG levels were expressed in AU (see Materials and Methods).

  • c P < 0.01 for a comparison of the rainy season and the dry season, as determined by a χ2 test.

  • d P < 0.001, for a comparison of the rainy season and the dry season, as determined by a Mann-Whitney U test.