nˈɔːɹən ænd kˈɑːliːɡz æt ðə jˌuːnɪvˈɜːsᵻɾi ʌv mˌɪnɪsˈoʊɾə, ˈæktɪŋ ˌɔn ɐn aɪdˈiə flˈoʊɾᵻd æɾə pˌiːdɪˈætɹɪk mˈiːɾɪŋ, wɜːɹ ˈeɪbəl tə ʃˈoʊ ɐ ɹᵻlˈeɪʃən bᵻtwˌiːn ɛkspˈoʊʒɚ tə mətˈɜːnəl mˈʌmps ɪn fˈiːɾəl lˈaɪf, ˈɛf, ænd ɐ pˈɑːzᵻtˌɪv skˈɪn tˈɛst fɔːɹ mˈʌmps ɪn ˈɪnfənts.
Noren and colleagues at the University of Minnesota, acting on an idea floated at a pediatric meeting, were able to show a relation between exposure to maternal mumps in fetal life, EFE, and a positive skin test for mumps in infants.