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Atrophic Rhinitis (AR)

See also Diseases and problems of the sucking pig.

(323) AR (progressive disease) is associated with the presence of toxin producing strains of a bacterium Pasteurella multocida. Clinically it is not important in the sow unless infection as a growing gilt had stunted her growth. However the sow might become a carrier, particularly if infected as an adult, and might spread it to other breeding animals and possibly to her litter. AR is controlled by vaccination, usually two doses 4 to 6 weeks apart. The sow is then re-vaccinated once approximately 2 to 3 weeks prior to each subsequent farrowing.

AR is only spread by close droplet contact and if the organism is not present in the herd the main method of entry will be by the carrier pig. However, nasal mucus from pigs with acute AR contains large numbers of organisms and these may be brought into a herd on a visitors clothes or equipment. Replacement breeding stock should be selected from herds that are known to be free of this disease. Such herds are monitored by regular examination of snouts at slaughter when the degree of damage to the turbinate bones is assessed; and also by nasal swabs taken from young growing pigs and breeding stock, cultured to demonstrate the absence of the organism.

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