IL2 and Interstitial pneumonitis: However, the interstitial pneumonitis was hardly observed in pMVAX1©-IL-2+pMVAX1©-GP35 and attenuated PRRS vaccine groups, which was significantly milder than that in pVAX1©-IL-2+pMVAX1©-GP35 and pMVAX1©-GP35 groups (Fig. 10).