Changes

==Signalment==

==Signalment==

'''High health status herds''' with lower immune challenges are '''more at risk''' then conventional herds.  Piglets from high health status herds can suddenly die without any premonitory signs. Disease progression can be '''exaccerbated by excessive temperature fluctuation, high humidity, mixing of pigs of different ages and overcrowding'''. '''Genetic make up''' and '''immune status''' can also influence infectivity rate and clinical signs.

'''High health status herds''' with lower immune challenges are '''more at risk''' then conventional herds.  Piglets from high health status herds can suddenly die without any premonitory signs. Disease progression can be '''exacerbated by excessive temperature fluctuation, high humidity, mixing of pigs of different ages and overcrowding'''. '''Genetic make up''' and '''immune status''' can also influence infectivity rate and clinical signs.

==Clinical Signs==

==Clinical Signs==