“…Maternal variola during pregnancy can cause abortion, stillbirth, or neonatal death (Plotz, 1965), and even the infants of healthy immune mothers may be infected in utero and may die from congenital variola (Schick, 1949;Rao, Ratnakannan, Balasubramaniam, and Gopalan, 1954). A similar situation exists with rubella (Schick, 1949).…”