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Volume 17, Number 3—March 2011

Research

Swine Influenza Virus Antibodies in Humans, Western Europe, 2009

Nancy A. Gerloff, Jacques R. Kremer, Emilie Charpentier, Aurélie Sausy, Christophe M. Olinger, Pierre Weicherding, John Schuh, Kristien Van Reeth, and Claude P. MullerComments to Author 
Author affiliations: Author affiliations: Centre de Recherche Public de la Santé/Laboratoire National de Santé, Luxembourg, Grand-Duchy of Luxembourg (N.A. Gerloff, J.R. Kremer, E. Charpentier, A. Sausy, C.P. Muller); Laboratoires Réunis, Junglinster, Luxembourg (C.M. Olinger, J. Schuh); Health Directorate, Luxembourg (P. Weicherding); Ghent University, Ghent, Belgium (K. Van Reeth)

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Table 2

Geometric mean titers for 3 influenza viruses in swine workers and controls, Luxembourg, 2008–2009*

Virus (strain) and participant age, y Study sample, % (95% CI)
p value†
Swine workers, n = 211 Controls, n = 224
Pandemic (H1N1) 2009 (A/Luxembourg/43/2009)
All 8.7 (7.5–10) 6.1 (5.6–6.6) 0.004
<60 9.2 (7.6–11.1)‡ 6 (5.5–6.7) <0.05
>60
5.6 (4.5–6.9)
5.4 (4.6–6.4)
0.897
Avian-like SIV (H1N1) (A/swine/Belgium/1/98)
All 10.3 (8.8–12) 7.7 (6.9–8.5) 0.168
<60 9.8 (8.1–11.8) 6.4 (5.8–7)§ <0.05
>60
11.2 (8–15.5)
13.6 (9.9–18.5)
0.170
Seasonal influenza (H1N1) (A/Luxembourg/572/2008)¶
All 23.2 (20.3–26.4) 13.9 (12.1–15.9) <0.001
<60 21.3 (18.3–24.7) 12.4 (10.7–14.4)# <0.001
>60 30.6 (22.7–41.1) 20.1 (15.3–28.7) 0.083

*%, no. persons/total no. persons in age groups with geometric mean titer cutoff >10. SIV, swine influenza virus.
†p value <0.05 for significance were calculated by using the Wilcoxon rank-sum test. Boldface indicates significance (p<0.05).
‡p<0.05, compared with swine contacts of the age group >60 y against pandemic (H1N1) 2009 virus.
§p<0.001, compared with controls of the age group >60 y against avian-like SIV.
¶Data for 210 swine workers, 221 controls.
#p = 0.001, compared with controls of the age group >60 y against seasonal influenza (H1N1).

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