Can amyloidosis be caused by a chronic virus, and if so, in what percent of cases?

We would say this is approximately 90% of the time, that a chronic viral infection is the cause of amyloidosis on a small or large scale. There can be other microbial insults which are chiefly responsible for this defensive measure by the body, given that beta-amyloid proteins, as has now been shown, are antimicrobial peptides produced to help ward off microbial invasion.