The blot signals were captured by using a DAB kit (Boster, China) following incubation with horseradish peroxidase-conjugated anti-mouse secondary IgG (Jackson, USA). Immunization of mice Male and female NIH mice, at 17-20 days old of age, were obtained from the animal center at the National Institute for the Control of Pharmaceutical and Biological Products (Beijing,
China). For the immunogenic study and intranasal challenge assays, mice were divided into seven groups (ten female mice in each group). Each mouse was immunized intraperitoneally on day 0 and 14 with 0.5 mL of each recombinant protein at two concentrations (20 or 4 μg/mouse), absorbed with adjuvant Al(OH)3 (0.5 mg per mouse). In control
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used as a control group. The experiments were supervised by Baricitinib the Animal Ethic Committee of National Institute for the Control of Pharmaceutical and Biological Products, Beijing. Antibody measurement Mouse serum antibodies against rPrn, rFim2 and rFim3 were measured by enzyme-linked immunosorbent assays (ELISA). Microtiter plates (Greiner, Germany) were coated with 50 μL of 0.05 M carbonate buffer (pH 9.6) containing 5 μg/mL of the purified recombinant protein. After blocking with PBS containing 0.05% Tween 20 and 1% bovine serum albumin, 50 μL of anti-serum was added in two-fold serial dilutions. Following incubation for 1 h at 37°C, goat anti-mouse IgG conjugated with horseradish peroxidase (Pierce, USA) were added to the plates. After another incubation at the same condition, signals were measured by using 2, 2′-azinobis (3-ethylbenzthiazolinesulfonic acid) (ABTS, Boehringer Mannheim, Germany) substrate according to the manufacturer’s instruction. Results were expressed as the highest dilution yielding the absorbance at 405 nm three times above the control values.