Hektoen1 concluded from his study of experimental measles that "the virus of measles is present in the blood of patients with typical measles some time at least during the first thirty hours of the eruption."
It would seem that Hektoen's experiments prove beyond a doubt that measles may be transmitted by injecting the blood of a person having measles into another person in normal health. One would expect, therefore, that infants in utero would be liable to contract measles if the mother should happen to have the disease during pregnancy. I wish, therefore, briefly to relate an observation which I have had the opportunity of making on this point. About seven years ago I called to see a woman who presented the usual signs of measles. She had never had the disease. Two children in the family were just recovering from it. She was in the eighth month of
Woods CS. IMMUNITY IN MEASLES. JAMA. 1914;LXIII(10):842. doi:10.1001/jama.1914.02570100028008