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Table 3 Distribution of 2009 H1N1 hemagglutination inhibition assay results

From: Evaluation of the seroprevalence of influenza A(H1N1) 2009 on a university campus: a cross-sectional study

H1N1 Lab Results   
< 10 80 26.7%
10 25 8.3%
20 14 4.7%
40 20 6.7%
80 44 14.7%
160 42 14.0%
320 25 8.3%
≤ 640 27 9.0%
No Results 21 7.0%
No Sample 2 0.7%