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Volume 16, Number 1—January 2010

Research

Norovirus Gastroenteritis Outbreak with a Secretor-independent Susceptibility Pattern, Sweden

Johan Nordgren, Elin Kindberg, Per-Eric Lindgren, Andreas Matussek, and Lennart SvenssonComments to Author 
Author affiliations: University of Linköping, Linköping, Sweden (J. Nordgren, E. Kindberg, P.-E. Lindgren, L. Svensson); National Board of Forensic Medicine, Linköping (E. Kindberg); County Hospital Ryhov, Jönköping, Sweden (P.-E. Lindgren, A. Matussek); Capio St Görans Hospital, Stockholm, Sweden (A. Matussek)

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Table 1

Distribution of histo-blood group antigens phenotypes and secretor status among 83 participants in a case–control study of a norovirus gastroenteritis outbreak in Sweden, 2007*

Antigen and secretor status No. (%) symptomatic persons, n = 33 No. (%) asymptomatic/ nonexposed persons, n = 50† Total no. (%) persons, n = 83 Normal distribution, % (95% CI)†‡
Blood type (n = 68)
A 14 (44) 18 (56) 32 (47) 47 (37–56)
B 2 (17) 10 (83) 12 (18) 15 (8–22)
O 10 (43) 13 (57) 23 (34) 33 (23–40)
AB
0
1 (100)
1 (1)
7 (2–12)
Lewis (n = 83)
Lea+b– 7 (58) 5 (42) 12 (14) 18 (11–26)
Lea–b+ 23 (38) 38 (62) 61 (73) 76 (68–84)
Lea–b–
3 (30)
7 (70)
10 (12)
6 (1–10)
Secretor status (n = 83)
Secretor§ 26 (38) 42 (62) 68 (82) 80 (72–88)
Nonsecretor 7 (47) 8 (53) 15 (18) 20 (12–28)

*ABO blood group could only be determined for the 68 secretor-positive persons (26 symptomatic and 42 asymptomatic). CI, confidence interval.
†p>0.15
‡See Larsson et al. (27).
§Homozygous and heterozygous.

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