Abigail Chomo, a widow, lives in a small brick house with her three children in Dzivarasekwa, a working class suburb west of Harare, Zimbabwe’s capital. She used to have four children. In November 2012, her youngest daughter, Helen, contracted typhoid fever at age 4, probably from drinking contaminated water. Although typhoid fever is treatable with antibiotics, Helen was also HIV positive and had a weak immune system, and died.