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Table 2 Positivity rate and distribution of fluorescent antibody responses of sera according to age

From: Detection of an antibody against Plasmodium vivax in residents of Gimpo-si, South Korea, using an indirect fluorescent antibody test

Age No. of Sera Tested No. of Positive Sera aIFAT serum dilution endpoint Positivity rate (%) bAPI
    < 1:32 ≥ 1:32 1:64 1:128 1:256 1:512 1:1024 1:2048   
0 - 9 299 7 292 3 4 0 0 0 0 0 2.34 0
10 - 19 604 7 597 4 3 0 0 0 0 0 1.16 0.16
20 - 29 389 5 384 2 1 0 1 1 0 0 1.29 0.43
30 - 39 784 11 773 6 4 1 0 0 0 0 1.40 0.33
40 - 49 842 23 819 10 8 3 0 2 0 0 2.73 1.04
50 - 59 912 19 893 8 8 3 0 0 0 0 2.08 1.69
60 - 69 1164 29 1135 18 5 2 1 3 0 0 2.49 1.68
70 - 79 638 19 619 11 4 2 2 0 0 0 2.98 2.39
80 - 89 162 5 157 1 0 2 0 0 1 1 3.09 5.62
90 - 99 3 0 3 0 0 0 0 0 0 0 0 0
Total 5797 125 5672 63 37 13 4 6 1 1 2.16 0.68
  1. Note. aIFAT; Indirect fluorescent antibody test
  2. bAPI; Annual parasite index from 1999
  3. * It shows significant correlation between age group and IFAT positivity rate of IFAT (P = 0.03) (except age group 90-99).
  4. §It shows significant correlation between age group and API (P = 0.003) (except age group 90-99).