Mesenteric lymphangitis and sepsis due to RTX toxin-producing Actinobacillus spp in 2 foals with hypothyroidism-dysmaturity syndrome

Löhr, C. V.; Polster, U.; Kuhnert, Peter; Karger, A.; Rurangirwa, F. R.; Teifke, J. P. (2012). Mesenteric lymphangitis and sepsis due to RTX toxin-producing Actinobacillus spp in 2 foals with hypothyroidism-dysmaturity syndrome. Veterinary pathology, 49(4), pp. 592-601. Middleton, Wis.: American College of Veterinary Pathologists 10.1177/0300985811402844

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Actinobacillus suis-like organisms (ASLOs) have been isolated from the genital, respiratory, and digestive tracts of healthy adult horses, horses with respiratory disease, and septic foals. Two foals with congenital hypothyroidism-dysmaturity syndrome from separate farms developed ASLO infection. At necropsy, both had contracted carpal flexor tendons, thyroid hyperplasia, and thrombotic and necrotizing mesenteric lymphangitis and lymphadenitis; one foal also had mandibular prognathism. Numerous ASLOs were isolated from tissues from both foals, including intestine. Biochemical testing and mass spectrometric analysis of the two Actinobacillus isolates did not allow unequivocal identification. Comparative genetic analysis was done on these and similar isolates, including phylogeny based on 16S rRNA, rpoB and recN genes, as well as RTX (repeat in toxin) toxin typing of apxIA-apxIVA and aqxA genes. One isolate was identified as Actinobacillus suis sensu stricto, based on the presence of apxIA and apxIIA but not aqxA, whereas the other isolate had aqxA but neither apxIA nor apxIIA, consistent with A equuli ssp haemolyticus. Based on genotypic analysis of the isolates included for comparison, 3 of 3 equine ASLOs and 2 of 5 A equuli isolates were reclassified as A equuli subsp haemolyticus, emphasizing the importance of toxin genotyping in accurate classification of actinobacilli.

Item Type:

Journal Article (Original Article)

Division/Institute:

05 Veterinary Medicine > Research Foci > Host-Pathogen Interaction
05 Veterinary Medicine > Department of Infectious Diseases and Pathobiology (DIP)
05 Veterinary Medicine > Department of Infectious Diseases and Pathobiology (DIP) > Institute of Veterinary Bacteriology

UniBE Contributor:

Kuhnert, Peter

Subjects:

500 Science
500 Science > 570 Life sciences; biology
600 Technology > 630 Agriculture

ISSN:

0300-9858

Publisher:

American College of Veterinary Pathologists

Submitter:

Peter Kuhnert-Ryser

Date Deposited:

18 Dec 2013 10:06

Last Modified:

08 Apr 2015 11:42

Publisher DOI:

10.1177/0300985811402844

PubMed ID:

21460119

Uncontrolled Keywords:

Actinobacillus suis–like organism, horses, lymphangitis, mesentery, polymerase chain reaction, RTX toxin

BORIS DOI:

10.7892/boris.39043

URI:

https://boris.unibe.ch/id/eprint/39043

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