 This fact can explain wide spread detection of SeV antibodies in humans in the 1950s-1960s.Recently published study also showed this wide spread detection.The study that was published in 2011 demonstrated that SeV neutralizing antibodies (which were formed due to human parainfluenza virus type 1 past infection) can be detected in 92.5% of human subjects worldwide with a median EC50 titer of 60.6 and values ranging from 5.9–11,324.