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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)

Main Article

Table 4

Neutralizing antibody reactivity >10 for 3 influenza viruses in swine workers and controls, Luxembourg, 2008–2009*

Participant
age in 2009, y
Pandemic (H1N1) 2009 (A/Luxembourg/43/2009)

Avian-like SIV (H1N1) (A/swine/Belgium/1/98)

Seasonal influenza (H1N1)
(A/Luxembourg/572/2008)
Swine workers
Controls
Swine workers
Controls
Swine workers
Controls
<40
22/69 (31.9;
22.1–43.6)†
12/80 (15;
8.8–24.4)

19/69 (27.5;
18.4–39.0)
15/80 (18.8;
11.7–28.7)

58/68 (85.3;
6.9–93.7)
50/78 (64.1;
53.5–74.8)
41–50
10/59 (16.9;
9.5–28.5)
5/58 (8.6;
3.7–18.6)

11/59 (18.6;
10.7–30.4)
8/58 (13.8;
7.2–24.9)

46/59 (78;
67.4–88.6)
29/57 (50.9;
37.9–63.9)
51–60
9/39 (15.3;
12.7–38.3)
3/41 (7.3;
2.5–19.4)

17/39 (43.6;
29.3–59.0)‡
8/41 (19.5;
10.2–34.0)

37/39 (94.9;
88.0–101.8)§
19/41 (46.3;
31.1–61.6)
>60
5/44 (8.6;
5.0–24.0)¶
3/45 (6.7;
2.3–17.9)#

19/44 (43.2;
29.7–57.8)
28/45 (62.2;
47.6–74.9)

42/44 (95.5;
89.3–101.6)**
34/45 (75.6;
63.0–88.1)
18–94 (total) 46/211 (21.8;
16.8–27.9)†† 23/224 (10.3;
6.9–14.9)‡‡ 66/211 (31.3;
25.4–37.8) 59/224 (26.3;
21.0–32.5) 183/210 (87.1;
83.0–91.9) 132/221 (59.7;
53.2–66.0)

*Values are no. persons/total no. persons in age groups with antibody reactivity >10 (%; 95% confidence interval). p values <0.05 cutoff for significance were calculated by using the χ2 test. SIV, swine influenza virus.
†p = 0.012, compared with controls of the same age group against pandemic (H1N1) 2009.
‡p = 0.037, compared with controls of the same age group against avian-like SIV (H1N1).
§p<0.001, compared with controls of the same age group against seasonal influenza (H1N1).
¶p = 0.002, compared with swine workers of the same age group against avian-like SIV (H1N1).
#p<0.001, compared with controls of the same age group against avian-like SIV (H1N1).
**p<0.05, compared with controls of the same age group against seasonal influenza (H1N1).
††p<0.05, compared with swine workers against avian-like SIV (H1N1).
‡‡p<0.001, compared with controls against avian-like SIV (H1N1).

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