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Actinobacillus pleuropneumoniae  (APP), the causative agent of porcine pleuropneumonia, is highly contagious and responsible for high morbidity, mortality, and economic losses in the swine industry worldwide, but quick serotyping and diagnosis are still not widely available. In this study, we sought to validate the use of Whatman FTA ®  cards for collection and processing of  A. pleuropneumoniae  isolates, or porcine lung tissue samples, for direct use in diagnostic multiplex PCRs. We have optimized the processing of 3-mm discs punched from FTA ®  cards loaded with cultured  A. pleuropneumoniae , or imprinted on lesioned regions of lung tissue, with only three distilled water washes before addition into our APP-multiplex PCR (mPCR) assay for rapid, low-cost identification and serotyping. DNA captured on FTA ®  cards generated the same diagnostic PCR results as DNA extracted using commercial kits for 85  A. pleuropneumoniae  clinical isolate cultures and 22 lung samples. Additionally, bacterial DNA bound to FTA ®  cards was detectable by PCR after 6 months of storage at 37°C. This study provides simple, efficient, rapid, and practical sample processing for detection and molecular serotyping of  A. pleuropneumoniae .

frontiers in veterinary science

Rapid Detection and Typing of Actinobacillus pleuropneumoniae Serovars Directly From Clinical Samples: Combining FTA® Card Technology With Multiplex PCR