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Active immunisation of pigs from the age of 8 weeks onwards against pandemic H1N1 porcine influenza virus to reduce viral lung load and viral excretion. Onset of immunity: 7 days after primary vaccination. Duration of immunity: 3 months after primary vaccination For intramuscular use. Vaccination: 2 injections of one dose (1 ml) from the age of 56 days, with an interval of 3 weeks between injections. The efficacy of revaccination has not been investigated and therefore no revaccination schedule is proposed. Maternally-derived antibodies in piglets interfere with the RESPIPORC FLUpan H1N1 mediated immunity. Generally, maternally-derived antibodies induced by vaccination last for approximately 5–8 weeks after birth. In cases of exposure of the sows to antigens (from either field infections and/or vaccination) the antibodies transmitted to the piglets can interfere with active immunisation at 12 weeks of age. In such cases the piglets should be vaccinated after the age of 12 weeks.
