Inactivation of African swine fever virus inoculated in liquid plasma by spray drying and storage for 14 days at 4˚C or 20˚C
African swine fever virus (ASFV) is a dsDNA virus that can cause high mortality in pigs of all ages. Spray-dried porcine plasma (SDPP) is a highly digestible ingredient used in feed because it benefits performance, gut function and immunity. The objectives were to test if the spray-drying (SD) condi...
| Autores: | , , , , , , |
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| Tipo de documento: | artigo |
| Data de publicação: | 2023 |
| País: | España |
| Recursos: | Institut de Recerca i Tecnologia Agroalimentàries (IRTA) |
| Repositório: | IRTA Pubpro. Open Digital Archive |
| OAI Identifier: | oai:repositori.irta.cat:20.500.12327/2776 |
| Acesso em linha: | http://hdl.handle.net/20.500.12327/2776 https://doi.org/10.1371/journal.pone.0290395 |
| Access Level: | Acceso aberto |
| Palavra-chave: | 619 |
| Resumo: | African swine fever virus (ASFV) is a dsDNA virus that can cause high mortality in pigs of all ages. Spray-dried porcine plasma (SDPP) is a highly digestible ingredient used in feed because it benefits performance, gut function and immunity. The objectives were to test if the spray-drying (SD) conditions along with post-drying storage of product for 14 days can inactivate ASFV inoculated in liquid plasma. Fresh liquid porcine plasma was inoculated with ASFV (BA71V) to a final concentration of 105.18 ±0.08 TCID50/mL of liquid plasma. Triplicate 2-L samples of spiked plasma were SD in a lab drier set at an outlet temperature of 80˚C or 71˚C. The final dried samples were stored at 4˚C or 20˚C for 14 d. Liquid and SD samples were analyzed for ASFV infectivity in two mirror 24-well plaques containing VERO cells monolayers. Wells were inoculated with different dilutions of SDPP dissolved 1:9 in PBS. One plaque was immediately frozen at -80˚C and the other was incubated at 37˚C for 3 d. Each dilution was replicated 9 times. After incubation both plaques were analyzed for ASFV by qRT-PCR. Results indicated that the SD process inactivated between 3.2 to 4.2 Logs ASFV TCID50/mL and 2.53 to 2.75 Logs TCID50/mL when the outlet temperature were 80˚C and 71˚C respectively. All SD samples stored at 4˚C or 20˚C for 14 d were absent of infectious ASFV. The combination of SD and post drying storage at both temperatures for 14 d was able to inactive >5.18 ±0.08 Log10 of ASFV inoculated in liquid porcine plasma, demonstrating that the manufacturing process for SDPP can be considered safe regarding ASFV. |
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