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Streptococcus suisin Swedish grower pigs: occurrence, serotypes, and antimicrobial susceptibility

Werinder, Anna and Backhans, Annette and Sjolund, Marie and Guss, Bengt and Jacobson, Magdalena (2020). Streptococcus suisin Swedish grower pigs: occurrence, serotypes, and antimicrobial susceptibility. Acta Veterinaria Scandinavica. 62 , 36 , 1-9
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Abstract

Background Streptococcus suisis a major cause of meningitis, arthritis, and pneumonia in pigs worldwide, and an emerging pathogen in humans. In Sweden, S. suishas previously received little attention but has in recent years become increasingly recognized as affecting the pig production. The aim of the present study was to investigate the occurrence, serotypes and antimicrobial susceptibility ofS. suisin Swedish grower pigs from herds with and without reported S. suis associated disease, as well as possible associations between S. suis associated disease and selected environmental and production factors. Swab samples were taken from the tonsils of clinically healthy 8-13-week-old grower pigs from ten case herds and ten control herds. Isolates were cultured, identified using MALDI-TOF MS, and serotyped using latex agglutination. The antimicrobial susceptibility of 188 isolates was tested using broth microdilution. Production data was gathered and environmental parameters were measured on the farms.
Results Streptococcus suis was isolated from 95% of the sampled pigs in both the case and the control herds. Serotypes 3, 4, 5, 7, 9, 10, 11, 15, 16, and 17-34 were detected, although a majority of the isolates (81.5%) were non-typeable. There was less diversity among the serotypes isolated from the case herds than among those from the control herds; four and nine different serotypes, respectively. Isolates resistant to penicillin (3.8%) were reported for the first time in Sweden. Tetracycline resistance was common (88.4%). No association was noted between the production and the environmental factors investigated, and the carriership ofS. suis.
Conclusions The carriership of S. suis was found to be higher in clinically healthy Swedish pigs than previously estimated, and for the first time, the presence of Swedish isolates resistant to penicillin was reported. Many of the most commonly disease-associated serotypes, e.g. serotypes 2, 9, 3, and 7, were detected in healthy grower pigs although further studies are needed to investigate the virulence of these isolates.

Authors/Creators:Werinder, Anna and Backhans, Annette and Sjolund, Marie and Guss, Bengt and Jacobson, Magdalena
Title:Streptococcus suisin Swedish grower pigs: occurrence, serotypes, and antimicrobial susceptibility
Year of publishing :2020
Volume:62
Article number:36
Number of Pages:9
Publisher:BMC
ISSN:0044-605X
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 403 Veterinary Science > Clinical Science
Keywords:Antibiotic resistance, Bacteria, Environmental factors, Infectious diseases, Meningitis, Microbiology, Porcine, Streptococci, Swine, Zoonosis
URN:NBN:urn:nbn:se:slu:epsilon-p-106981
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-106981
Additional ID:
Type of IDID
DOI10.1186/s13028-020-00533-3
Web of Science (WoS)000545671100002
ID Code:17347
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(VH) > Department of Biomedical Science and Veterinary Public Health
(VH) > Dept. of Clinical Sciences
Deposited By: SLUpub Connector
Deposited On:28 Aug 2020 09:34
Metadata Last Modified:28 Aug 2020 09:34

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