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Table 2 Serum antibody responses among subjects with confirmed A(H1N1)pdm09 infections

From: Rapid research response to the 2009 A(H1N1)pdm09 influenza pandemic (Revised)

Serologic status

Group size

HAI antibody

Neutralizing antibody

≥4-Fold Rise in Titer (Acute + convalescent sera available)

15

8

11

Acute Titer ≥ 20; No Significant Rise in Titer

15

6

2

Convalescent Titer ≥ 20 (No acute sample)

10

9

9

Titer < 20 in All Sample(s)

26

2

2

Titer ≥ 40 in Acute and/or Convalescent Sample

26

18

20

No Data

4

4

4