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 Svensson
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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