Younger pigs can suffer from neurological and respiratory signs which can be quite severe.

Symptomatic treatment for the inflammatory and respiratory signs can be given, but severe cases may benefit from euthanasia.

Velogenic strains produce severe nervous and respiratory signs, spread rapidly and cause up to 90% mortality.

In laying hens, there can be transient respiratory signs, but mortality may be negligible.

Most commonly, respiratory signs are seen.

Gastrointestinal, respiratory and neurological signs have also been reported.

Affected piglets can develop septicaemia, multifocal infections, respiratory signs, and may die.

They will also have respiratory signs including bilateral nasal discharge, dyspnoea, tachypnoea and coughing.

A variety of gastrointestinal, respiratory and systemic signs may also be seen as the virus infects multiple body systems.

Pigs usually cough and may show more severe respiratory signs if secondary bacteria have invaded.