Serovars and antimicrobial resistance profiles of Actinobacillus pleuropneumoniae isolates from clinical-case pigs in Taiwan
Abstract Background Pleuropneumonia remains an important challenge to swine production worldwide. The causative agent, Actinobacillus pleuropneumoniae serovar prevalence in countries can change over time. Few Taiwanese A. pleuropneumoniae prevalence studies have been published, and recent large-scal...
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2025-08-01
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| Series: | BMC Veterinary Research |
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| Online Access: | https://doi.org/10.1186/s12917-025-04878-7 |
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| author | Wei-Fan Kwan Yanwen Li Janine T. Bossé Ming-Tang Chiou Hsien-Jen Chiu Paul R. Langford Preben Mortensen Chao-Nan Lin |
| author_facet | Wei-Fan Kwan Yanwen Li Janine T. Bossé Ming-Tang Chiou Hsien-Jen Chiu Paul R. Langford Preben Mortensen Chao-Nan Lin |
| author_sort | Wei-Fan Kwan |
| collection | DOAJ |
| description | Abstract Background Pleuropneumonia remains an important challenge to swine production worldwide. The causative agent, Actinobacillus pleuropneumoniae serovar prevalence in countries can change over time. Few Taiwanese A. pleuropneumoniae prevalence studies have been published, and recent large-scale investigations remain notably scarce. This study aimed to identify the serovars and antimicrobial sensitivity of 96 current Taiwanese A. pleuropneumoniae clinical isolates. Results Among the 99 A. pleuropneumoniae determinations, 40 (40.4%) were serovar 15, 29 (29.3%) were serovar 5, 15 (15.2%) were serovar 1, 11 (11.1%) were serovar 7, and 4 (4.0%) were serovar 2. Therefore serovar 15 was the most predominant between 2015 and 2022. Resistance of the isolates was minimal to ceftiofur (3.2%), cephalexin (5.2%), cephalothin (6.3%) and enrofloxacin (9.3%), moderate to gentamicin (28.4%), and high for florfenicol, amoxicillin and ampicillin (45.1–68.4%). Conclusions This study updates the serovar and antimicrobial sensitivity patterns of Taiwanese clinical A. pleuropneumoniae isolates, showing that serovars 15, 5, 1, 7, and 2 collectively predominate in clinical outbreaks. Local A. pleuropneumoniae isolates exhibited high resistance to antimicrobials currently used in the Taiwanese pig production, such as amoxicillin, ampicillin, and florfenicol. However, there was low resistance to cephalexin, cephalothin, tilmicosin and lincospectin (injectable only) which can be recommended for current use in Taiwan, considering both efficacy and public health risks. Notably, isolates of the same serovar collected from the same farm on the same day occasionally displayed distinct resistance patterns, emphasizing the complex dynamics of antimicrobial resistance. Our data will help veterinarians and producers refine vaccination and treatment protocols, highlighting the importance of ongoing surveillance to respond effectively to evolving resistance trends. |
| format | Article |
| id | doaj-art-accbd79f4da34b4ea9c1f297fffe87c5 |
| institution | Kabale University |
| issn | 1746-6148 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | BMC |
| record_format | Article |
| series | BMC Veterinary Research |
| spelling | doaj-art-accbd79f4da34b4ea9c1f297fffe87c52025-08-20T03:46:00ZengBMCBMC Veterinary Research1746-61482025-08-012111810.1186/s12917-025-04878-7Serovars and antimicrobial resistance profiles of Actinobacillus pleuropneumoniae isolates from clinical-case pigs in TaiwanWei-Fan Kwan0Yanwen Li1Janine T. Bossé2Ming-Tang Chiou3Hsien-Jen Chiu4Paul R. Langford5Preben Mortensen6Chao-Nan Lin7Ceva Animal HealthDepartment of Infectious Disease, Imperial College LondonDepartment of Infectious Disease, Imperial College LondonDepartment of Veterinary Medicine, College of Veterinary Medicine, National Pingtung University of Science and TechnologyDepartment of Veterinary Medicine, College of Veterinary Medicine, National Pingtung University of Science and TechnologyDepartment of Infectious Disease, Imperial College LondonCeva Corporate SwineDepartment of Veterinary Medicine, College of Veterinary Medicine, National Pingtung University of Science and TechnologyAbstract Background Pleuropneumonia remains an important challenge to swine production worldwide. The causative agent, Actinobacillus pleuropneumoniae serovar prevalence in countries can change over time. Few Taiwanese A. pleuropneumoniae prevalence studies have been published, and recent large-scale investigations remain notably scarce. This study aimed to identify the serovars and antimicrobial sensitivity of 96 current Taiwanese A. pleuropneumoniae clinical isolates. Results Among the 99 A. pleuropneumoniae determinations, 40 (40.4%) were serovar 15, 29 (29.3%) were serovar 5, 15 (15.2%) were serovar 1, 11 (11.1%) were serovar 7, and 4 (4.0%) were serovar 2. Therefore serovar 15 was the most predominant between 2015 and 2022. Resistance of the isolates was minimal to ceftiofur (3.2%), cephalexin (5.2%), cephalothin (6.3%) and enrofloxacin (9.3%), moderate to gentamicin (28.4%), and high for florfenicol, amoxicillin and ampicillin (45.1–68.4%). Conclusions This study updates the serovar and antimicrobial sensitivity patterns of Taiwanese clinical A. pleuropneumoniae isolates, showing that serovars 15, 5, 1, 7, and 2 collectively predominate in clinical outbreaks. Local A. pleuropneumoniae isolates exhibited high resistance to antimicrobials currently used in the Taiwanese pig production, such as amoxicillin, ampicillin, and florfenicol. However, there was low resistance to cephalexin, cephalothin, tilmicosin and lincospectin (injectable only) which can be recommended for current use in Taiwan, considering both efficacy and public health risks. Notably, isolates of the same serovar collected from the same farm on the same day occasionally displayed distinct resistance patterns, emphasizing the complex dynamics of antimicrobial resistance. Our data will help veterinarians and producers refine vaccination and treatment protocols, highlighting the importance of ongoing surveillance to respond effectively to evolving resistance trends.https://doi.org/10.1186/s12917-025-04878-7Actinobacillus pleuropneumoniaeDiseasesSerotypingSerovarAntimicrobial susceptibility testing (AST)Antimicrobial resistance (AMR) |
| spellingShingle | Wei-Fan Kwan Yanwen Li Janine T. Bossé Ming-Tang Chiou Hsien-Jen Chiu Paul R. Langford Preben Mortensen Chao-Nan Lin Serovars and antimicrobial resistance profiles of Actinobacillus pleuropneumoniae isolates from clinical-case pigs in Taiwan BMC Veterinary Research Actinobacillus pleuropneumoniae Diseases Serotyping Serovar Antimicrobial susceptibility testing (AST) Antimicrobial resistance (AMR) |
| title | Serovars and antimicrobial resistance profiles of Actinobacillus pleuropneumoniae isolates from clinical-case pigs in Taiwan |
| title_full | Serovars and antimicrobial resistance profiles of Actinobacillus pleuropneumoniae isolates from clinical-case pigs in Taiwan |
| title_fullStr | Serovars and antimicrobial resistance profiles of Actinobacillus pleuropneumoniae isolates from clinical-case pigs in Taiwan |
| title_full_unstemmed | Serovars and antimicrobial resistance profiles of Actinobacillus pleuropneumoniae isolates from clinical-case pigs in Taiwan |
| title_short | Serovars and antimicrobial resistance profiles of Actinobacillus pleuropneumoniae isolates from clinical-case pigs in Taiwan |
| title_sort | serovars and antimicrobial resistance profiles of actinobacillus pleuropneumoniae isolates from clinical case pigs in taiwan |
| topic | Actinobacillus pleuropneumoniae Diseases Serotyping Serovar Antimicrobial susceptibility testing (AST) Antimicrobial resistance (AMR) |
| url | https://doi.org/10.1186/s12917-025-04878-7 |
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