Laboratory investigations
Virus detection was carried out on all blood samples collected upon challenge infection, and on spleen samples taken at necropsy using virus isolation techniques on PBMC derived macrophages.Viral genome was detected in blood samples collected upon challenge infection, and in samples of blood, spleen, tonsil and salivary gland collected at necropsy by real-time polymerase chain reaction(qPCR).Blood for the preparation of PBMC-derived macrophages was collected from domestic donor pigs. Cells were prepared aspreviously described [10,11] and used for virus titrations and hemadsorption tests. Both methods were carried out according to standard procedures [12]. For quantitative real-time PCR (qPCR),viral DNA was extracted using the QIAamp®DNA Mini Kit (QIAGEN)according to the manufacturer’s instructions. Subsequently, qPCRwas performed according to the protocol published by King et al.[13] using a Bio-Rad CFX Cycler (Bio-Rad Laboratories). A dilutionseries of a synthetic standard with known copy numbers was used to quantify genome copies in the respective samples. To confirmintegrity of the p73 antigen after inactivation, immunogen preparations were tested in the commercial antigen ELISA Ingezim PPADAS K2 (INGENASA) according to the manufacturer‘s instructions.Moreover, genome copy numbers were compared prior and afterinactivation.Sera were tested for the presence of ASFV p73- and p30-specific antibodies using the INGEZIM PPA COMPAC ELISA (Ingenasa)and the SVANOVIR ASFV-Ab (SVANOVA) according to the manufacturer’s instructions. To assess neutralizing capacities of sera obtained prior to challenge infection, macrophage infection inhibition assays were carried out along with neutralization tests on permanent wild boar lung cells (WSL). Hemadsorption inhibition and indirect immunofluorescence staining was used asreadout (methodological details are available from the authors upon request).
ห้องปฏิบัติการตรวจสอบ Virus detection was carried out on all blood samples collected upon challenge infection, and on spleen samples taken at necropsy using virus isolation techniques on PBMC derived macrophages.Viral genome was detected in blood samples collected upon challenge infection, and in samples of blood, spleen, tonsil and salivary gland collected at necropsy by real-time polymerase chain reaction(qPCR).Blood for the preparation of PBMC-derived macrophages was collected from domestic donor pigs. Cells were prepared aspreviously described [10,11] and used for virus titrations and hemadsorption tests. Both methods were carried out according to standard procedures [12]. For quantitative real-time PCR (qPCR),viral DNA was extracted using the QIAamp®DNA Mini Kit (QIAGEN)according to the manufacturer’s instructions. Subsequently, qPCRwas performed according to the protocol published by King et al.[13] using a Bio-Rad CFX Cycler (Bio-Rad Laboratories). A dilutionseries of a synthetic standard with known copy numbers was used to quantify genome copies in the respective samples. To confirmintegrity of the p73 antigen after inactivation, immunogen preparations were tested in the commercial antigen ELISA Ingezim PPADAS K2 (INGENASA) according to the manufacturer‘s instructions.Moreover, genome copy numbers were compared prior and afterinactivation.Sera were tested for the presence of ASFV p73- and p30-specific antibodies using the INGEZIM PPA COMPAC ELISA (Ingenasa)and the SVANOVIR ASFV-Ab (SVANOVA) according to the manufacturer’s instructions. To assess neutralizing capacities of sera obtained prior to challenge infection, macrophage infection inhibition assays were carried out along with neutralization tests on permanent wild boar lung cells (WSL). Hemadsorption inhibition and indirect immunofluorescence staining was used asreadout (methodological details are available from the authors upon request).
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