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Table 2 Frequency of IAV shedding in nursery pigs in two longitudinal studies stratified by sow source

From: Longitudinal study of influenza A virus circulation in a nursery swine barn

N detectionsa Source 1 Source 2 Source 3 Source 4 Source 5 Total N Total % (95% CI)
Study 1
 0 0 0 0 0 0 0 0.0  
 1 0 12 4 15 7 38 46.9 (35–58)
 2 7 1 6 0 2 16 19.7 (11–30)
 3 9 2 8 0 6 25 30.8 (21–42)
 4 2 0 0 0 0 2 2.4 (1–8)
 Totalb 18 15 18 15 15 81c 100.0c  
N detectionsa Source 1 Source 2 Source 3 Source 4 Source 5 Total N Total % (95% CI)
Study 2
 0 4 6 4 4 9 27 36.0 (25–47)
 1 6 4 10 10 6 36 48.0 (36–59)
 2 4 5 1 1 0 11 14.6 (7–24)
 3 1 0 0 0 0 1 1.3 (1–7)
 4 0 0 0 0 0 0 0.0  
 Totalb 15 15 15 15 15 48c 64.0c (52.1–74.8)c
  1. aNumber of times that virus was isolated from individual nursery pigs.
  2. bTotal number of pigs included in the study by sow source.
  3. cRepresents number of pigs that were positive at least once in the study. May not be a sum of this column or row.