Figure 1From: Newcastle disease virus-attenuated vaccine LaSota played a key role in the pathogenicity of contaminated exogenous virusClinical symptoms and percent survival curve. A HPS, the accumulation of clear, straw-coloured fluid in the pericardial sac. B IBH, the discoloured swollen liver with pinpoint haemorrhage of dead chicks. C Percent survival of each group (these data have been published in a previous study [5]).Back to article page