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Table 1 Frequency distribution of HAI titers for SST

From: Influence of sample collection tube method, anticoagulant-containing plasma versus serum, on influenza virus hemagglutination inhibition titer and microneutralization titer serological assays

SST Titer

Type A, H1N1

Type A, H3N2

Type B

< 40

3

1

12

40 - < 80

6

5

11

80 - < 160

7

6

4

160 - < 320

9

9

3

320 - < 640

1

4

0

640 - < 1280

4

4

0

1280

0

1

0