Phylum Actinobacteria, Class Actinobacteria, Subclass Actibacteridae, Order Actynomycetales, Suborder Actinomycinae, Family
Actinomycetaceae, Genus Actinobaculum, Actinobaculum suis (Wegienek and Reddy 1982) Lawson, Falsen, Akervall, Vandamme
and Collins 1997, emend. Yassin, Sproer, Pukall, Sylvester, Siering and Schumann 2015.
Historical synonyms: Corynebacterium suis Soltys and Spratling 1957; Eubacterium suis (ex Soltys and Spratling 1957) Wegienek
and Reddy 1982; Actinomyces suis (Wegienek and Reddy 1982) Ludwig et al. 1992.
Gram-positive straight or curved diphtheroid rods, 2-3 / 0.3-0.5 µm. Non-motile.
On Columbia agar (Difco) with 5% horse blood, colonies are translucent, granular,
white, 0.5-3.0 mm in diameter after 2 days of anaerobic incubation at 37 ºC; after 5
days more, colonies flatten, has 3-5 mm, are dry, opaque, grey, with crenate edges and
raised and denser centres than the rest of the colony, giving a “fried-egg” appearance.
Non-haemolytic. Obligate anaerobic.
Isolated from cases of cystitis, pyelonephritis and metritis in pregnant sows.
- Yassin A.F., Sproer C., Pukall R., Sylvester M., Siering C. and Schumann P., 2015. Dissection of the genus Actinobaculum:
reclassification of Actinobaculum schaalii Lawson et al. 1997 and Actinobaculum urinale Hall et al. 2003 as Actinotignum schaalii
gen. nov., comb. nov. and Actinotignum urinale comb. nov., description of Actinotignum sanguinis sp. nov. and emended
descriptions of the genus Actinobaculum and Actinobaculum suis; and re-examination of the culture deposited as Actinobaculum
massiliense CCUG 47753T (5DSM 19118T), revealing that it does not represent a strain of this species. J Syst Evol Microbiol 65,
Description is based on API Coryne, API 20 Strep and API ZYM results.
Positive results for acid and alkaline phosphatase, esterase lipase (C8), alpha-glucosidase, beta-glucuronidase, N-acetyl-beta-
glucosaminidase, hippurate hydrolysis, leucine arylamidase, alpha-mannosidase, pyrrolidonyl arylamidase, urease, acid production
from glycogen, maltose, ribose, starch and D-xylose.
Negative results for arginine dihydrolase, catalase, cystine arylamidase, esculin hydrolysis, esterase (C4), lecithinase, lipase (C14),
alpha-fucosidase, alpha- and beta-galactosidase, beta-glucosidase, gelatin hydrolysis, H2S production, indole production, nitrate
reduction, oxidase, pyrazinamidase, trypsin, alpha-chymotrypsin, valine arylamidase, Voges-Proskauer test, acid production from
adonitol, amygdalin, L-arabinose, cellobiose, dulcitol, erythritol, fructose, galactose, D-glucose, glycerol, inositol, inulin, lactose,
mannitol, melezitose, melibiose, raffinose, rhamnose, sorbitol, salicin, sucrose, threonine and trehalose.
(c) Costin Stoica
Opportunistic pathogen for sows. Exotoxin is not produced. Isolated from cases of cystitis, pyelonephritis and metritis in pregnant sows.