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Table 3 Number of pigs (%) with detectable antibodies at weaning and description of other categorical variables

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

Variable Study 1a Study 2b
N (%) N (%)
H3N2_A + vec 15 (18.5) 66 (88.0)
H3N2_B +vec 49 (60.5) 72 (96.0)
H3N2_C +vec 39 (48.1) 61 (81.3)
H3N2_home +ved 60 (74.1) 67 (89.3)
H1N2 +vee 43 (53.1) 62 (82.8)
H1N1_C +vef 7 (8.6) 14 (18.7)
H1N1_P +veg 15 (18.5) 24 (32.0)
H1N1_home +ved 42 (51.8) 22 (29.3)
Cluster_H3N2_Heterologoush
 Cluster 1 (low heterologous) 65 (80.2) 45 (60.0)
 Cluster 2 (high heterologous) 16 (19.7) 24 (32.0)
 Cluster 3 (high heterologous) 6 (8.0)
 PRRSV +vei 25 (30.9) 14 (18.7)
 Mhyo +vej 67 (82.7) 64 (85.3)
 Female 52 (65.8) 37 (49.4)
 Male 27 (34.2) 38 (50.7)
 Room5 45 (55.6) 30 (40.0)
 Room6 9 (11.1) 30 (40.0)
 Room7 27 (33.3) 15 (20.0)
  1. a,bTwo distinct longitudinal studies were performed in nursery pigs.
  2. cDifferent H3N2 variants broadly classified into cluster 4 of H3N2 swine influenza A virus and isolated in Ontario in 2012 and used in the hemagglutination inhibition assay.
  3. dH3N2 and H1N1 viruses detected in the study and used as antigens in the hemagglutination inhibition assay.
  4. eH1N2 with hemagglutinin of the 2009 pandemic lineage and neuraminidase of the Cluster 4 H3N2 IAV-S.
  5. fH1N1 influenza A virus (IAV-S) broadly classified as the classical swine H1N1 virus used in hemagglutination inhibition assay.
  6. gH1N1 influenza A virus (IAV-S) of the 2009 H1N1 pandemic lineage used in hemagglutination inhibition assay.
  7. hGroupings based on cluster analysis of maternally derived antibodies for heterologous strains of H3N2 viruses (labeled here withc).
  8. iPositive for maternally derived antibodies for PRRSV.
  9. jPositive for maternally derived antibodies for Mycoplasma hyopneumoniae.