“…In the present study, the variation in the detection of IAV RNA in the farms, which was from 10 to 100%, and of antibodies in the piglets, from 22.5 to 97.5%, may have been due to piglet origin, viral loads, virulence of IAV, and biosecurity measures (Silva et al, 2019). Some practices have shown positive or protective effects on the prevalence of the influenza virus in pigs, including the vaccination of pigs and farm staff (Oliveira & Iguti, 2010), the use of anti-bird netting, the delimitation of a specific facility for the acclimatization of gilts, and the internal replacement of breeders (Silva et al, 2019). Regarding vaccination, commercial or autogenous vaccines are a possibility, but the choice of one or another depends on the identification of the subtypes that are occurring in a given herd (Mancera Gracia et al, 2020;Vincent et al, 2020), which should be done by the genomic or antigenic analysis.…”