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1. A novel selective medium for the isolation of Burkholderia mallei from equine specimens

Author:
Niwa, Hidekazu,   et al.   ; Kinoshita, Yuta; Cloutier, Ashley K.; Rozak, David A.; Khan, Md. S. R.; Uchida-Fujii, Eri; Katayama, Yoshinari; Tuanyok, Apichai;     Show all 8 Authors
Source:
BMC veterinary research 2019 v.15 no.1 pp. 133
ISSN:
1746-6148
Subject:
Burkholderia mallei; Burkholderia pseudomallei; Burkholderia thailandensis; Gram-negative bacteria; agar; blood; fungi; glanders; horses; laboratory diagnosis; nasal cavity; selective media; zoonoses
Abstract:
... BACKGROUND: Burkholderia mallei is a Gram-negative bacterium that causes glanders, a zoonotic disease, especially in equine populations (e.g. horses, donkeys, and mules). B. mallei usually grows slowly on most culture media, and this property makes it difficult to isolate from clinical specimens. One of the problems is that B. mallei is easily overgrown by other bacteria, especially in animal spec ...
DOI:
10.1186/s12917-019-1874-0

2. Minocycline Resistance in Streptococcus equi Subsp. zooepidemicus Isolated From Thoroughbred Racehorses With Respiratory Disease in Japan

Author:
Niwa, Hidekazu,   et al.   ; Kinoshita, Yuta; Katayama, Yoshinari;     Show all 3 Authors
Source:
Journal of equine veterinary science 2018 v.63 pp. 80-85.e2
ISSN:
0737-0806
Subject:
Streptococcus equi subsp. zooepidemicus; Thoroughbred; adults; bacterial infections; drugs; genetic variation; genotype; minimum inhibitory concentration; minocycline; multilocus sequence typing; pathogens; racehorses; resistance genes; respiratory tract diseases; Japan
Abstract:
... Streptococcus zooepidemicus is a dominant pneumococcal pathogen in adult horses and comprises a wide diversity of strain genotypes. Minocycline has been used as a second-line drug for lower respiratory bacterial infection in the facilities of Japan Racing Association. The aim of this study was to reveal the relationship between genotypes of equine S. zooepidemicus and tetracycline resistance genes ...
DOI:
10.1016/j.jevs.2017.08.012

3. Geospatial and temporal associations of Getah virus circulation among pigs and horses around the perimeter of outbreaks in Japanese racehorses in 2014 and 2015

Author:
Niwa, Hidekazu,   et al.   ; Bannai, Hiroshi; Nemoto, Manabu; Murakami, Satoshi; Tsujimura, Koji; Yamanaka, Takashi; Kondo, Takashi;     Show all 7 Authors
Source:
BMC veterinary research 2017 v.13 no.1 pp. 187
ISSN:
1746-6148
Subject:
Getah virus; epizootic diseases; monitoring; racehorses; sequence analysis; seroprevalence; swine; viruses; Japan
Abstract:
... BACKGROUND: We studied a recent epizootic of Getah virus infection among pigs in the southern part of Ibaraki Prefecture and the northern part of Chiba Prefecture, Japan, focusing on its possible association with outbreaks in racehorses in 2014 and 2015. The genomic sequence of a Getah virus strain from an infected pig was analyzed to evaluate the degree of identity with the strains from horses. R ...
DOI:
10.1186/s12917-017-1112-6
PubMed:
28629406
PubMed Central:
PMC5477264

4. Development of a loop-mediated isothermal amplification method for detecting virulent Rhodococcus equi

Author:
Niwa, Hidekazu,   et al.   ; Kinoshita, Yuta; Higuchi, Tohru; Katayama, Yoshinari;     Show all 4 Authors
ISSN:
1943-4936
Subject:
Rhodococcus equi; bacteria; bacterial culture; equipment; foals; gene amplification; genes; loop-mediated isothermal amplification; pneumonia; quantitative polymerase chain reaction; veterinarians; virulence
Abstract:
... Rhodococcus equi is the most important causative bacterium of severe pneumonia in foals. We report herein the development of a specific loop-mediated isothermal amplification (LAMP) assay, which targets a gene encoding vapA for detecting virulent R. equi. The detection limit of the LAMP assay was 10⁴ colony forming units (CFU)/mL, which was equal to 10 CFU/reaction. The clinical efficacy of the LA ...
DOI:
10.1177/1040638716656222

5. Aneurysm of the cranial mesenteric artery as a site of carriage of Salmonella enterica subsp. enterica serovar Abortusequi in the horse

Author:
Niwa, Hidekazu,   et al.   ; Hobo, Seiji; Kinoshita, Yuta; Muranaka, Masanori; Ochi, Akihiro; Ueno, Takanori; Oku, Kazuomi; Hariu, Kazuhisa; Katayama, Yoshinari;     Show all 9 Authors
ISSN:
1943-4936
Subject:
Anoplocephala perfoliata; Gasterophilus intestinalis; Parascaris equorum; Salmonella Abortusequi; Strongylus vulgaris; agglutination; aneurysm; bacteria; blood; bone marrow; draft horses; enzootic diseases; farms; intestines; larvae; lymph nodes; mesenteric arteries; necropsy; parasitoses; pathogens; plasmids; pulsed-field gel electrophoresis; serotypes; thrombosis; virulence; Japan
Abstract:
... Salmonella enterica subsp. enterica serovar Abortusequi is a pathogen restricted to horses. Our investigation targeted 4 draft horses (9–10 months old) kept on a Japanese farm that had suffered an outbreak of S. Abortusequi abortion. The 4 horses were suspected to be carriers of the bacterium owing to their high agglutination titers (≥1:2,560) in tube agglutination testing. The owners’ on-farm obs ...
DOI:
10.1177/1040638716649640

6. Rapid detection of equine coronavirus by reverse transcription loop-mediated isothermal amplification

Author:
Niwa, Hidekazu,   et al.   ; Nemoto, Manabu; Morita, Yoshinori; Bannai, Hiroshi; Tsujimura, Koji; Yamanaka, Takashi; Kondo, Takashi;     Show all 7 Authors
Source:
Journal of virological methods 2015 v.215-216 pp. 13-16
ISSN:
0166-0934
Subject:
Coronavirinae; RNA; equipment; feces; horses; monitoring; pathogens; quantitative polymerase chain reaction; rapid methods; reverse transcriptase polymerase chain reaction; reverse transcription loop-mediated isothermal amplification
Abstract:
... A reverse transcription loop-mediated isothermal amplification (RT-LAMP) assay was developed for the rapid detection of equine coronavirus (ECoV). This assay was conducted at 60°C for 40min. Specificity of the RT-LAMP assay was confirmed using several equine intestinal and respiratory pathogens in addition to ECoV. The novel assay failed to cross-react with the other pathogens tested, suggesting i ...
DOI:
10.1016/j.jviromet.2015.02.001

7. Experimental inoculation of equine coronavirus into Japanese draft horses

Author:
Niwa, Hidekazu,   et al.   ; Nemoto, Manabu; Oue, Yasuhiro; Morita, Yoshinori; Kanno, Toru; Kinoshita, Yuta; Ueno, Takanori; Katayama, Yoshinari; Bannai, Hiroshi; Tsujimura, Koji; Yamanaka, Takashi; Kondo, Takashi;     Show all 12 Authors
Source:
Archives of virology 2014 v.159 no.12 pp. 3329-3334
ISSN:
0304-8608
Subject:
Coronavirinae; amyloid; anorexia; blood serum; disease course; feces; fever; gastrointestinal system; horses; leukocyte count; monitoring; neutralization tests; nose; pathogenesis; viral shedding; viremia; viruses; Japan; United States
Abstract:
... Recently, outbreaks associated with equine coronavirus (ECoV) have occurred in Japan and the United States. While ECoV is likely to be pathogenic to horses, it has not been shown that experimental inoculation of horses with ECoV produces clinical signs of disease. In this study, we inoculated three Japanese draft horses with an ECoV-positive diarrheic fecal sample to confirm infection after inocul ...
DOI:
10.1007/s00705-014-2205-1
PubMed:
25139547

8. Pneumocystis Pneumonia in a Thoroughbred Racehorse

Author:
Niwa, Hidekazu,   et al.   ; Ueno, Takanori; Kinoshita, Yuta; Katayama, Yoshinari; Hobo, Seiji;     Show all 5 Authors
Source:
Journal of equine veterinary science 2014 v.34 no.2 pp. 333-336
ISSN:
0737-0806
Subject:
Pneumocystis carinii; Thoroughbred; antibiotics; collagen; colts; ferrets; foals; fungi; lungs; macrophages; necropsy; nucleotide sequences; phylogeny; pneumonia; polymerase chain reaction; racehorses; ribosomal RNA; silver; staining
Abstract:
... Pneumocystis pneumonia is an opportunistic respiratory infection that occurs in immunocompromised animals. In horses, pneumocystic pneumonia is observed mostly in foals and often progresses rapidly. Here, we report pneumocystic pneumonia in a Thoroughbred racehorse. A 3-year-old Thoroughbred racehorse colt had marked respiratory symptoms for 3 weeks and was unresponsive to antibiotic treatment. At ...
DOI:
10.1016/j.jevs.2013.07.004

9. No evidence of horizontal infection in horses kept in close contact with dogs experimentally infected with canine influenza A virus (H3N8)

Author:
Niwa, Hidekazu,   et al.   ; Yamanaka, Takashi; Nemoto, Manabu; Bannai, Hiroshi; Tsujimura, Koji; Kondo, Takashi; Matsumura, Tomio; Muranaka, Masanori; Ueno, Takanori; Kinoshita, Yuta; Hidari, Kazuya IPJ; Suzuki, Takashi;     Show all 12 Authors
Source:
Acta veterinaria scandinavica 2012 v.54 no.1 pp. 790
ISSN:
1751-0147
Subject:
euthanasia; nose; Influenza A virus; dogs; cough; viruses; seroconversion; viral load; lungs; Streptococcus equi subsp. zooepidemicus; eggs; horses; United States
Abstract:
... BACKGROUND: Since equine influenza A virus (H3N8) was transmitted to dogs in the United States in 2004, the causative virus, which is called canine influenza A virus (CIV), has become widespread in dogs. To date, it has remained unclear whether or not CIV-infected dogs could transmit CIV to horses. To address this, we tested whether or not close contact between horses and dogs experimentally infec ...
DOI:
10.1186/1751-0147-54-25
PubMed:
22506984
PubMed Central:
PMC3416777

10. Design and application of group-specific oligonucleotide probes for detecting and monitoring mouse Clostridia

Author:
Niwa, Hidekazu,   et al.   ; Momose, Yoshika; Park, Sang-Hee; Iwasaki, Teruko; Maruyama, Aya; Raangs, Gerwin C; Harmsen, Hermie J M; Welling, Gjalt W; Itoh, Kikuji;     Show all 9 Authors
Source:
Laboratory animals 2011 v.45 no.4 pp. 259-267
ISSN:
1758-1117
Subject:
Bacteroides; Clostridium; Lactobacillus; bacterial communities; fluorescence in situ hybridization; hosts; intestinal microorganisms; intestines; mice; monitoring; oligonucleotide probes; specific pathogen-free animals
Abstract:
... Clostridia dominate the rodent intestinal bacterial community and play an important role in physiological functions of the host. However, their ecology and diversity are still unclear. In our previous report, we showed that phylogenetically novel groups of Clostridia inhabit the mouse intestine and contribute to the normalization of germfree mice. In this study, five new oligonucleotide probes wer ...
DOI:
10.1258/la.2011.010136

11. Mortierella wolfii keratomycosis in a horse

Author:
Niwa, Hidekazu,   et al.   ; Wada, Shinya; Ode, Hirotaka; Hobo, Seiji; Katayama, Yoshinari; Takatori, Kosuke;     Show all 6 Authors
Source:
Veterinary ophthalmology 2011 v.14 no.4 pp. 267-270
ISSN:
1463-5216
Subject:
Mortierella; case studies; cattle; eyes; fillies; fungi; hyphae; medical treatment; microbial growth; opacity
Abstract:
... Purpose To describe a case of superficial keratomycosis caused by Mortierella wolfii (M. wolfii) in a horse. Methods A thoroughbred filly was presented with painful right eye of 2 days' duration. A superficial corneal ulcer was observed ventrally together with multifocal punctuate opacities axially. Samples were collected by swabbing and scraping the ulcerated lesion and submitted for microbiologi ...
DOI:
10.1111/j.1463-5224.2011.00891.x
PubMed:
21733069

12. Ulcerative keratitis in thoroughbred racehorses in Japan from 1997 to 2008

Author:
Niwa, Hidekazu,   et al.   ; Wada, Shinya; Hobo, Seiji;     Show all 3 Authors
Source:
Veterinary ophthalmology 2010 v.13 no.2 pp. 99-105
ISSN:
1463-5216
Subject:
racehorses; horse diseases; keratitis; cornea; etiology; disease prevalence; Japan
Abstract:
... To describe the number of cases, etiologies, healing times, and results of microbial culture and susceptibility testing of corneal ulcers in thoroughbred racehorses in Japan. Retrospective study of the medical records of racehorses belonging to the Japan Racing Association (JRA) from 1997 to 2008. A total of 2846 horses suffered ulcerative keratitis. These horses accounted for 90.5% of all the cor ...
DOI:
10.1111/j.1463-5224.2010.00767.x
PubMed:
20447028