ɪt sˈiːmz ˌʌndɪnˈaɪəbəl ðæt tɹænsplˈeɪsəntəl mˈʌmps ɪnfˈɛkʃən hɐdbɪn ɪnðə pˈæst ðə mˈeɪdʒɚ kˈɔːz ʌv ˌiːˌɛfˈiː, ænd ðæt ˌɪmjuːnᵻzˈeɪʃən wʌz ˌɪndˈiːd ðə kˈɔːz ʌv ˌiːˌɛfˈiː hˌævɪŋ bɪkˌʌm ɹˈɛɹ.
It seems undeniable that transplacental mumps infection had been in the past the major cause of EFE, and that immunization was indeed the cause of EFE having become rare.