Relapsing hepatitis due to cytomegalovirus?

A case of agammaglobulinaemia with hyper IgM (the 'hyper-IgM syndrome') is described, in which a serological diagnosis of cytomegalovirus infection was made during repeated episodes of hepatitis. Three unrelated serological tests agreed with each other, but eventually it appeared that the reactions were non-specific. This shows the limitation of confirmation by tests which are used routinely.