The importance of the wild boar as a reservoir of Lawsonia intracellularis was assessed by investigating the seroprevalence of this pathogen among wild boars in the Republic of Korea by Jung-Yong Yeh of Incheon National University.

The extent of exposure to L. intracellularis among wild boars (Sus scrofa coreanus) was monitored by a country-wide serological survey using an immunoperoxidase mono-layer assay and published in a paper in BMC Veterinary Medicine.

In this study, antibodies to L. intracellularis were observed in 165 of 716 clinically healthy wild boars tested.

The overall apparent prevalence calculated directly from the sample and the true prevalence calculated based on the accuracy of the test method were 23.0 per cent (95 per cent confidence interval: 20.0-26.3 per cent) and 25.6 per cent (95 per cent confidence interval: 23.9 to 27.2 per cent), respectively. Serologically positive animals were found in all the tested provinces.

Yeh reports that the results confirm L. intracellularis is present in the wild boar population worldwide, even in Far East Asia.

Despite the high seroprevalence shown in wild boars, further studies are warranted to evaluate their potential as a reservoir species because seroprevalence does not prove ongoing infection nor shedding of the bacteria in amounts sufficient to infect other animals.

Yeh added that it should also be determined whether the wild boar, like the domestic pig, is a natural host of L. intracellularis.

Reference

Yeh J-Y. 2014. Seroprevalence of porcine proliferative enteropathy among wild boars in the Republic of Korea. BMC Veterinary Research. 10:5 doi:10.1186/1746-6148-10-5

January 2014