Swine influenza virus infection dynamics in two pig farms : results of a longitudinal assessment
Simon Grifé, Meritxell (Institut de Recerca i Tecnologia Agroalimentàries. Centre de Recerca en Sanitat Animal)
Martín Valls, Gerard Eduard (Institut de Recerca i Tecnologia Agroalimentàries. Centre de Recerca en Sanitat Animal)
Vilar Ares, Maria José (Institut de Recerca i Tecnologia Agroalimentàries. Centre de Recerca en Sanitat Animal)
Busquets, Núria (Institut de Recerca i Tecnologia Agroalimentàries. Centre de Recerca en Sanitat Animal)
Mora Salvatierra, Mercedes (Institut de Recerca i Tecnologia Agroalimentàries. Centre de Recerca en Sanitat Animal)
Bestebroer, Theo M.
Fouchier, Ron A. M.
Martín Castillo, Margarita (Universitat Autònoma de Barcelona. Departament de Sanitat i d'Anatomia Animals)
Mateu de Antonio, Enrique María (Universitat Autònoma de Barcelona. Departament de Sanitat i d'Anatomia Animals)
Casal i Fàbrega, Jordi (Universitat Autònoma de Barcelona. Departament de Sanitat i d'Anatomia Animals)

Data:	2012
Resum:	In order to assess the dynamics of influenza virus infection in pigs, serological and virological follow-ups were conducted in two whole batches of pigs from two different farms (F1 and F2), from 3 weeks of age until market age. Anti-swine influenza virus (SIV) antibodies (measured by ELISA and hemagglutination inhibition) and nasal virus shedding (measured by RRT-PCR and isolation in embryonated chicken eggs and MDCK cells) were carried out periodically. SIV isolates were subtyped and hemagglutinin and neuraminidase genes were partially sequenced and analyzed phylogenetically. In F1, four waves of viral circulation were detected, and globally, 62/121 pigs (51. 2%) were positive by RRT-PCR at least once. All F1 isolates corresponded to H1N1 subtype although hemagglutination inhibition results also revealed the presence of antibodies against H3N2. The first viral wave took place in the presence of colostral-derived antibodies. Nine pigs were positive in two non-consecutive sampling weeks, with two of the animals being positive with the same isolate. Phylogenetic analyses showed that different H1N1 variants circulated in that farm. In F2, only one isolate, H1N2, was detected and all infections were concentrated in a very short period of time, as assumed for a classic influenza outbreak. These findings led us to propose that influenza virus infection in pigs might present different patterns, from an epidemic outbreak to an endemic form with different waves of infections with a lower incidence.
Nota:	Altres ajuts: MININN/AGL2007-64673/GAN
Nota:	Altres ajuts: CONSOLIDER-INGENIO/2010-CSD2006-2007
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Llengua:	Anglès
Document:	Article ; Versió publicada
Publicat a:	Veterinary research, Vol. 43, N. 24 (March 2012) , p. 1-11, ISSN 1297-9716

DOI: 10.1186/1297-9716-43-24
PMID: 22452923

11 p, 2.0 MB

Additional file 1 2 p, 6.6 KB

Additional file 2 5 p, 16.5 KB

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