I would expect that if this common cold virus had such an effect it would have been noticed by someone before now. I'm not a doctor or anything, but it just seems unlikely.
"Compared to the 48 hours pre-exposure, participants interacted with significantly more people, and in significantly larger groups, during the 48 hours immediately post-exposure [to a directly transmitted human pathogen-flu virus]."
> [...]
> "Put simply, lonelier people feel worse when they are sick than less lonely people,"
It might be other way around. People with common cold become more social (virus makes them like that to spread) so they suffer more from loneliness.