Following outbreaks across continental Europe, there’s nervousness that Newcastle disease could threaten UK flocks. Michael Barker reports With all the focus on avian flu, there’s been another disease quietly threatening to cause a major headache for UK producers. Newcastle disease (ND) is on the march in Europe, with a major outbreak in Poland followed by new cases in the Czech Republic, Germany and Spain as concerns grow that the disease could reach these shores. ND is highly contagious in poultry, and can spread rapidly through direct contact with contaminated birds – both alive and dead – as well as bodily…