Table 1. Reduction in viral load of infected duck embryonic fibroblast (DEF) cells following treatment with Ribavirin.

		PaBV-4 positive cell foci		Area of infected cells (%)
Virus (ffu)	Ribavirin (μg/mL)	Median	(25th– 75th percentile)	Median	(25th– 75th percentile)
64	0	36	35–37	47.7	47.2–48.2
	0.25	40	33–46	49.5	46.7–52.3
	2.5	73	72–73	30.6	29.0–32.2
	25.0	1	0.5–1.5	0.4	0.4–0.5
7	0	50	48–51	9.1	8.5–9.8
	0.25	73	72–73	12.5	12.0–13.0
	2.5	19	18–20	4.3	4.1–4.5
	25.0	2	2–2	0.5	0.4–0.5
1	0	7	6–7	1.6	1.5–1.6
	0.25	7	6–9	1.3	1.0–1.6
	2.5	4	3–4	0.9	0.9–0.9
	25.0	1	0–1	0.6	0.6–0.6
No virus (negative control)	0	0	0	0.2	0.2–0.3
	0.25	1	0.5–1.5	0.2	0.2–0.2
	2.5	0	0	0.4	0.4–0.4
	25.0	1	0.5–1.5	0.7	0.6–0.8

Cells infected with 0.05 and 0.005 ffu had PaBV-4 positive cell foci and percent area of infected cells similar to No virus (negative control).