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Table 3 Histopathological pulmonary findings in pigs challenged with an HP PRRSV 2 field strain (n = 10 per group)

From: Efficacy of live attenuated porcine reproductive and respiratory syndrome virus 2 strains to protect pigs from challenge with a heterologous Vietnamese PRRSV 2 field strain

  No. of piglets group 1 No. of piglets group 2
Interstitial pneumonia 4a 10b
 Alveolar histiocytosis 4 7
 Desquamative/purulent bronchitis 3 7
Dystelectasis 8 10
  1. Group 1 – pre-vaccinated with an experimental PRRSV 2 live vaccine
  2. Group 2 – not pre-vaccinated
  3. Significant differences (P < 0.05) between the groups are indicated with different letters