The formation of CIC may not benefit to the control of virus replication and the induction of anti-virus immunity; CIC has a role in the pathogenesis after SIV infection.

"We actually control for their immunity," he says. "the explanation isn't that extroverts interact with more people, and therefore have immunity to that virus."

As people would have no natural immunity, a new influenza virus could cause widespread death, illness, social and economic disruption.