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Table 1 Sampling program for sows and piglets

From: Longitudinal field studies reveal early infection and persistence of influenza A virus in piglets despite the presence of maternally derived antibodies

  Two weeks before farrowing Week 1 Week 3 Week 5 Weeks 10–12
Sows Blood samples Nasal swabs    
Piglets   Nasal swabs Blood sample + nasal swabs Nasal swabs Blood sample + nasal swabs