# Table 5 Proportions of infection or clinical morbidity among household contacts of children and adults among three TIV vaccination status groups during the three consecutive influenza seasons

1st Year   2nd Year   3rd Year
Children, Number (proportion) TIV(-) TIV(+) P TIV(-) Partial TIV TIV(+) P TIV(-) Partial TIV TIV(+) P
N = 37 N = 43   N = 72 N = 38 N = 14   N = 31 N = 32 N = 74
4-fold increase
H1N1 6(0.16) 6(0.14)   29(0.40) 10(0.26) 3(0.21)   13(0.42) 12(0.38) 31(0.42)
H3N2 4(0.11) 14(0.33)   30(0.42) 17(0.45) 4(0.29)   11(0.35) 6(0.19) 26(0.35)
B 4(0.11) 3(0.07)   35(0.49) 17(0.45) 7(0.50)   6(0.19) 14(0.44) 18(0.24)
pH1N1 - -   55(0.76) 27(0.71) 13(0.93)   - - -
Any 4-fold increase 14(0.38) 20(0.47)   44(0.61) 23(0.61) 7(0.50)   22(0.71) 21(0.66) 52(0.70)
Symptoms
Any 17(0.46) 29(0.67)   36(0.50) 22(0.58) 9(0.64)   19(0.61) 13(0.41) 37(0.50)
Fever 5(0.14) 14(0.33)   7(0.10) 1(0.03) 1(0.07)   3(0.10) 6(0.19) 9(0.12)
Fever plus any two symptoms 3(0.08) 10(0.23)   4(0.06) 0(0.00) 0(0.00)   1(0.03) 4(0.13) 7(0.09)
Any 4-fold increase plus any symptoms 5(0.14) 15(0.35) * 24(0.33) 13(0.34) 5(0.36)   27(0.87) 24(0.75) 62(0.84)
Adults, Number (proportion) TIV(-) TIV(+) P TIV(-) Partial TIV TIV(+) P TIV(-) Partial TIV TIV(+) P
N = 98 N = 116   N = 222 N = 111 N = 109   N = 77 N = 74 N = 249
Any 4-fold increase
H1N1 0(0.00) 2(0.02)   70(0.32) 46(0.41) 41(0.38)   10(0.13) 19(0.26) 60(0.24)
H3N2 9(0.09) 17(0.15)   57(0.26) 38(0.34) 41(0.38) * 3(0.04) 0(0.00) 6(0.02)
B 5(0.05) 3(0.03)   70(0.32) 45(0.41) 38(0.35)   4(0.05) 6(0.08) 18(0.07)
pH1N1 - -   109(0.49) 57(0.51) 55(0.50)   - - -
Any 4-fold increase 14(0.14) 20(0.17)   135(0.61) 74(0.67) 75(0.69)   11(0.14) 20(0.27) 64(0.26)
Symptoms
Any 43(0.44) 52(0.45)   55(0.25) 34(0.31) 39(0.36) * 30(0.39) 31(0.42) 105(0.42)
Fever 9(0.09) 5(0.04)   1(0.00) 4(0.04) 2(0.02)   2(0.03) 1(0.01) 7(0.03)
Fever plus any two symptoms 0(0.00) 1(0.01)   0(0.00) 0(0.00) 0(0.00)   1(0.01) 0(0.00) 5(0.02)
Any 4-fold increase plus any symptoms 7(0.07) 7(0.06)   39(0.18) 24(0.22) 24(0.22)   38(0.49) 42(0.57) 131(0.53)
1. *P < 0.05.