Death of Ellen and Margaret Curley

I have known for a while about the family tradition that says that Ellen and Margaret Curley, my father's sisters, died young of typhoid fever after eating tainted ice cream at a party. I found a while ago a 1911 reference to a "recent" epidemic of typhoid traced to a dairy that had not sanitized its milk buckets. I now have dates for the deaths of Ellen and Margaret. Ellen (Ella in the index) died on March 29, 1908, and Margaret on March 31. This fits the story that the family had just come home from burying one girl, only to find the other one dead.