[FredZarguna]

The article you're citing makes the case for vaccination. It shows why herd immunity is important. The index patient is immunocompromised and would not have been exposed to the virus in a community where there was widespread vaccination.

[Greg67]

that’s the first case the index person is not listed is the one that infected that first immunodeficient patient and she become source for the other 3 or you think vaccine strain viruses are running wild in environment because that’s even worse