Research into Newcastle Disease, which is a particularly nasty disease for chickens is being undertaken through a project of the Poultry Co-operative Research Centre.
The severity of the clinical signs of ND is influenced by the strain of
virus and the age, condition and species of the bird. Clinical signs
in poultry range from a mild, almost inapparent respiratory disease
to a very severe depression, drop in egg production, increased
respiration, profuse diarrhoea followed by collapse, or long-term
nervous signs (such as twisted necks) if the birds survive. Death
rate can be up to 100 per cent in severe (virulent) forms of the
disease. The incubation period is usually 5 – 6 days, but can vary
from 2 – 15 days.
Strains of ND virus that cause no disease, known as avirulent, low
virulence or lentigenic strains, are common in Australian poultry
flocks.
Direct sunlight destroys the virus in about 30 minutes.
More details on the CRC website at http://www.poultryhub.org/2013/02/pathogenicity-of-newcastle-disease/
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