Table 1.

Production of infectious ABBV-1 in primary embryonic fibroblasts of chicken (CEF), duck (DEF), and goose (GEF), at the end of multi- and single-step growth curves (21 days post-infection). Each value represents the log₁₀ of the mean titre (expressed in FFU) +/− standard deviation per 10⁶ cells, as assessed in n = 3 replicates. Values were not given for CEF, as no infectious virus could be detected by immunofluorescence in these cells. N/A = no titre available for CEF; ns = not significant.

	GEF	DEF	CEF	Statistically Significant
Multi-Step	3.94 ± 0.06	4.07 ± 0.24	N/A	ns
Single-Step	3.77 ± 0.11	3.85 ± 0.21	N/A	ns