<prompt> Which of the following methods can be used to detect rubella infection in childrenT4 cell countFetal hemoglobinIgM antibody in fetal bloodIgA Antibody in fetal blood  <response>: Laboratory diagnosisIsolation of virus in cell cultures of throat samples, urine or other secretions.Normally, a maternal rubella antibody in the form of IgG is transferred to infants and is gradually last over a period of 6 months. Persistent beyond I year in an unvaccinated child suggests the diagnosis of congenital rubella.Presence of IgM antibodies is diagnostic.PCR for rubella RNA. 