Complex sentence: Thus an elevated IgM titre indicates recent primary infection but the presence of IgG does not reveal whether the infection is recent or past.ie.The presence of IgM is a sign of current or recent infections.
Split into simpler sentences: THUS an elevated IgM titre INDICATES RECENT PRIMARY INFECTION BUT IgG cannot reveal whether the infection is recent or currently active. Presence of IgM is a sign of current or recent infections.