The diagnosis of measles is confirmed by laboratory testresults, including a positive result for measles-specific immunoglobulin M (IgM)titre, significant increase in measles-specific immunoglobulin G (IgG) titreusing paired serum, the detection of measles virus (MV) by reverse transcriptionpolymerase chain reaction (RT–PCR) or isolation of MV in cell culture. Here, CD40LG is linked to measles.