Figure 2: Shows the effect of different dose of lived NDV, UV-NDV, and heatinactivated NDV AF2240 on NO induction on RAW 264.7 macrophages cells. Cells were co-cultured for 24 hours with different HA of the virus, the level of NO in the culture supernatants were measured as a sum of nitrate and nitrite using calorimetric assay with Griess reagent. Data were expressed as mean ± SEM *P<0.05 when compared with the negative control.