Affinity, avidity, IgM, IgG, serological surveys and ‘antibody passports’

This article is the latest in a series of weekly columns about all things infection and immunity written by Nobel Laureate Professor Peter Doherty for the Doherty Institute, Setting It Straight.

Affinity we’ve met before when talking about the specific binding of Ig receptors to their complementary (cognate) antigens, but avidity, what’s that about?