Table 1 General characteristics of H1N1 vaccine recipients and controls

^aCD4⁺ T cells/μL Mean ± SD

420 ± 235

529 ± 269

609 ± 277

475 ± 241

0–200

1 (8.3%)

9 (11%)

3 (8.3%)

5 (11%)

201–350

5 (42%)

13 (16%)

4 (11%)

9 (20%)

351–500

2 (17%)

15 (19%)

4 (11%)

11 (25%)

>500

4 (33%)

44 (54%)

25 (69%)

19 (43%)

Log₁₀ viral load Median (IQR)

1.60 (1.60-2.09)

1.60 (1.60-2.70)

1.60 (1.60-2.34)

1.60 (1.60-3.07)

≤1.60

8 (67%)

50 (62%)

23 (64%)

27 (61%)

1.61-2.60

3 (25%)

11 (14%)

7 (19%)

4 (9.1%)

2.61-3.00

0

2 (2.5%)

1 (2.8%)

1 (2.3%)

3.01-4.00

0

6 (7.4%)

1 (2.8%)

5 (11%)

>4.00

1 (8.3%)

12 (14%)

4 (11%)

7 (16%)

Age (years) Mean ± SD

45.7 ± 6.6

45.2 ± 7.2

44.2 ± 7.5

46.2 ± 7.0

Male

8 (67%)

56 (69%)

27 (75%)

29 (66%)

Female

4 (33%)

25 (31%)

9 (25%)

16 (36%)

^bPre-existing anti-H1N1

ND

28 (35%)

22 (61%)

6 (14%)