Abstract:

Intradermal vaccination against pseudorabies virus and swine influenza in growing/finishing pigs

Ioannis C. Papatsas, DVM; Spiros C. Kyriakis, DVM, PhD; Orestis Papadopoulos, DVM, PhD; Kriton J. Sarris, DVM, PhD; Stefanos Lekkas, DVM, PhD

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Objective-- To investigate the effect of vaccination against pseudorabies virus (PRV) and swine influenza virus (SIV) in growing/finishing pigs on growth performance parameters.

Methods-- In a herd free of porcine reproductive and respiratory syndrome virus (PRRSV), 300 growing/finishing pigs were vaccinated according to one of five protocols: 1) a single PRV vaccination, 2) a double SIV vaccination, 3) a single PRV and a double SIV vaccination, 4) a double PRV and a double SIV vaccination, and 5) no vaccination (control). Average daily gain (ADG), average total feed consumption (ATFC), feed conversion ratio (F:G), and pathological and bacteriological findings were compared among treatment groups.

Results-- Pigs vaccinated twice against PRV and SIV had significantly better ADG, ATFC, and F:G than all other treatment groups. Twice-vaccinated pigs also had significantly lower lung lesion scores. Bacteriological examination revealed the presence of secondary bacterial pathogens, such as Pasteurella multocida, Staphylococcus spp and Proteus spp, in lungs of all treatment groups except those twice vaccinated against PRV and SIV.

Implications-- Double intradermal vaccination of pigs against both PRV and SIV may improve growth performance and may reduce the impact of secondary bacterial pathogens on lungs.

Keywords: pseudorabies virus, swine influenza virus, growth

Cite as: Papatsas IC, Kyriakis SC, Papadopoulos O, et al. Intradermal vaccination against pseudorabies virus and swine influenza in growing/finishing pigs. J Swine Health Prod 1996;4(6):279-285.

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