Newcastle disease appears in Swedish layer flock

There were more than 230,000 chickens on the affected farm.

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The presence of Newcastle disease has been confirmed in a commercial egg laying flock in Helsingborg, Sweden.

The World Organisation for Animal Health (WOAH) reported that decreased egg production and abnormal eggs were noticed at the affected farm, although no other clinical signs were observed. Testing was conducted at the National Veterinary Institute, with those tests proving positive for Newcastle disease.

The affected flock included 231,438 birds, and of those, 57,787 were described as positive cases.

A 3-kilometer protection zone and a 10-kilometer surveillance zone have been established. Other protective measures that are being applied include stamping out, movement control, traceability, surveillance, disinfection of the premises, destruction of animal products and disposal of carcasses, by-products and waste.

Sweden had been free of Newcastle disease since February 2023, WOAH reported. 

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