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. 2012 Aug;90(8):2784–2793. doi: 10.2527/jas.2011-4518

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Figure 2. — (A) Viremic concentration and (B) antibody titer in control- or mannan oligosaccharide [Actigen, ACT (Alltech, Inc., Nicholasville, KY)]-fed pigs infected with porcine reproductive and respiratory syndrome virus (PRRSV). The antibody titer is presented as sample to positive control (S/P) ratios and viremic concentration as cycle threshold (Ct) values of all infected pigs. The Ct values presented are inversely related to virus concentrations. The antibody response of pigs to PRRSV was found negative (S/P < 0.4) at 7 d postinoculation and positive at 21 and 35 DPI. Dietary ACT did not affect the antibody titer at 21 DPI (P = 0.139), but increased it at 35 DPI (P = 0.042). Dietary ACT did not affect the viremic concentrations of infected pigs throughout the experimental period. Values were means ± pooled SEM. A pig was an experimental unit; each treatment had 8 pigs except ICON (7 pigs, 1 pig euthanized at 18 d postinfection). ICON: infected control-fed pigs; IACT: infected ACT-fed pigs. *P < 0.05.