PMID- 32326275 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20200928 IS - 2306-7381 (Electronic) IS - 2306-7381 (Linking) VI - 7 IP - 2 DP - 2020 Apr 21 TI - Atypical Multibacterial Granulomatous Myositis in a Horse: First Report in Italy. LID - 10.3390/vetsci7020047 [doi] LID - 47 AB - Infectious causes of myositis are reported relatively uncommonly in horses. Among them, bacterial causes include Streptococcus equi subsp. zooepidemicus, Actinobacillus equuli, Fusobacterium spp. Staphylococcus spp, and Corynebacterium pseudotuberculosis. Infection can be spread to muscles via haematogenous or extension from skin lesions. Parasitic myositis has also been documented. In this report, a 12 year-old Italian Quarter Horse mare presented with diffuse subcutaneous nodules and masses ranging from 2 x 3 to 5 x 20 cm in size, and adherent to subcutis and muscles that were first macroscopically and cytologically diagnosed as pyogranulomas. Subsequently, histological, molecular, bacteriological, and biochemical investigations were performed. All the data obtained allowed to diagnose a severe and diffuse multibacterial granulomatous myositis caused by Corynebacterium pseudotuberculosis and Corynebacterium amycolatum. Following the therapy and an initial disappearance of most of the lesions together with a general improvement of the mare, the clinical condition deteriorated, and new nodules appeared. Matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) and PCR techniques revealed the presence of bacteria as Glutamicibacter creatinolyticus and Dietzia spp. To the authors' knowledge, this case report represents the first description of multibacterial granulomatous myositis due to Corynebacterium pseudotuberculosis, Corynebacterium amycolatum, Glutamicibacter creatinolyticus, and Dietzia spp. in a horse reared in Italy. FAU - Rifici, Claudia AU - Rifici C AD - Department of Veterinary Science, University of Messina, Polo Universitario dell'Annunziata, 98168 Messina (ME), Italy. FAU - Attili, Anna-Rita AU - Attili AR AUID- ORCID: 0000-0002-9085-7125 AD - School of Biosciences and Veterinary Medicine, University of Camerino, Via Circonvallazione 93/95, 62024 Matelica (MC), Italy. FAU - De Biase, Davide AU - De Biase D AD - Department of Pathology and Animal Health, University of Naples "Federico II", Via Federico Delpino 1, 80137 Napoli, Italy. FAU - Goncalves Dos Santos, Roselane AU - Goncalves Dos Santos R AD - Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais 31270-901, Brazil. FAU - Seyffert, Nubia AU - Seyffert N AD - Institute of Biology, Federal University of Bahia, Salvador-Bahia 40170-115, Brazil. FAU - De Paula Castro, Thiago Luiz AU - De Paula Castro TL AUID- ORCID: 0000-0002-2869-5065 AD - Institute of Health Sciences, Federal University of Bahia, Salvador-Bahia 40170-115, Brazil. FAU - Pereira Figueiredo, Henrique Cesar AU - Pereira Figueiredo HC AD - School of Veterinary, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais 31270-901, Brazil. FAU - Scaramozzino, Carmelo AU - Scaramozzino C AD - Scaravet Equine Breeding Center, Via Don Minzoni, 29, 89124 Reggio Calabria, Italy. FAU - Reale, Stefano AU - Reale S AD - Molecular Biology Department, Experimental Zooprophylactic Institute (IZS) of Sicily, Via Gino Marinuzzi 3, 90129 Palermo (PA), Italy. FAU - Paciello, Orlando AU - Paciello O AUID- ORCID: 0000-0003-3091-0905 AD - Department of Pathology and Animal Health, University of Naples "Federico II", Via Federico Delpino 1, 80137 Napoli, Italy. FAU - Cuteri, Vincenzo AU - Cuteri V AUID- ORCID: 0000-0001-9536-3506 AD - School of Biosciences and Veterinary Medicine, University of Camerino, Via Circonvallazione 93/95, 62024 Matelica (MC), Italy. FAU - Spier, Sharon Jane AU - Spier SJ AD - Department of Veterinary Medicine and Epidemiology, University of California, Davis, CA 95616, USA. FAU - Azevedo, Vasco AU - Azevedo V AUID- ORCID: 0000-0002-4775-2280 AD - Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais 31270-901, Brazil. FAU - Mazzullo, Giuseppe AU - Mazzullo G AD - Department of Veterinary Science, University of Messina, Polo Universitario dell'Annunziata, 98168 Messina (ME), Italy. LA - eng PT - Case Reports DEP - 20200421 PL - Switzerland TA - Vet Sci JT - Veterinary sciences JID - 101680127 PMC - PMC7355418 OTO - NOTNLM OT - Corynebacterium pseudotuberculosis OT - Dietzia spp. OT - Glutamicibacter creatinolyticus OT - bacterial myositis OT - horses COIS- The authors declare no conflict of interest. EDAT- 2020/04/25 06:00 MHDA- 2020/04/25 06:01 PMCR- 2020/04/21 CRDT- 2020/04/25 06:00 PHST- 2020/03/21 00:00 [received] PHST- 2020/04/07 00:00 [revised] PHST- 2020/04/17 00:00 [accepted] PHST- 2020/04/25 06:00 [entrez] PHST- 2020/04/25 06:00 [pubmed] PHST- 2020/04/25 06:01 [medline] PHST- 2020/04/21 00:00 [pmc-release] AID - vetsci7020047 [pii] AID - vetsci-07-00047 [pii] AID - 10.3390/vetsci7020047 [doi] PST - epublish SO - Vet Sci. 2020 Apr 21;7(2):47. doi: 10.3390/vetsci7020047.