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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 1

Characteristics of persons tested for 3 influenza viruses, Luxembourg, 2008–2009*

Characteristic
Swine workers, no. (%),† n = 211
Controls, no. (%),‡ n = 224
Sex
M 143 (67.8) 151 (67.4)
F
68 (32.2)
73 (32.6)
Age group, y§
18–40 69 (32.7) 80 (35.7)
41–50 59 (28) 58 (25.9)
51–60 39 (18.5) 41 (18.3)
61–94
44 (20.9)
45 (20.1)
Profession
Farmer 133 NA
Slaughterhouse worker 51 NA
Other¶
27
NA
Years worked with swine
<1 4 (1.9) NA
1–4 26 (12.3) NA
5–10 26 (12.3) NA
>10 155 (73.5) NA
Unknown
0
224
Frequency of swine contact
Rarely 3 (1.4) NA
Monthly 2 (0.9) NA
Weekly 25 (11.8) NA
Daily 179 (84.8) NA
Unknown
2 (0.9)
NA
Frequency of close contact (<1 m) with swine
Never 1 (0.5) NA
Rarely 3 (1.4) NA
Occasionally 10 (4.7) NA
Often 22 (10.4) NA
Always
175 (82.9)
NA
Self-reported influenza vaccine in past 5 y
No/unsure 155 (73.5) NA
Yes
56 (26.5)
NA
Self-reported infection with seasonal influenza
No 145 (68.7) NA
Yes
57 (27.0)
NA
Exposure to swine
Only until 1997 26 NA
Only until 2007 59 NA
Until time of collection 152 NA

*NA, not available.
†Sampled in July 2009.
‡Sampled in December 2008.
§Mean (median) age 48.2 (48) years for swine workers, 47.6 (47.2) years for controls.
¶Veterinarian, butcher, hunter.

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