Data were analysed using the SAS software package, release 9.3 (SAS Institute, Cary, NC).
All dates were processed by SPSS statistical software package release 16.0 (SPSS Inc., Chicago, IL, USA).
All statistical tests were performed at the two-tailed α level of 0.05, and data were analyzed using the SAS software package, release 9.4 (SAS Institute, Cary, NC).
All statistical analyses were performed with Stata statistical software package (release 10.0; Stata Corporation, College Station, Texas, USA).
Stained cells were documented by epifluorescence microscopy using a Zeiss Axiovert 200 M epifluorescence microscope and the Axio vision software package (release 4.6.3, Zeiss, Jena, Germany).
Clinical scores, weights, temperatures and shedding levels were analysed using analysis of variance (one-way ANOVA with 95% confidence intervals) in the Minitab software package (Release 14).
All simulations are performed within the STATA package release 12.
All simulations are performed using the STATA package release 12.
All the statistical tests were performed with the SPSS software package (release 14.0).
We used the SAS package, release 9.3 (SAS Institute Inc., Cary, NC, USA) for all analyses.
Descriptive statistics were performed with the SPSS SPSS Inc.., Chicago, IL) statistical package release 11.01.
