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But Now They Are Angels is Gene Gangarosa’s unique first-person narrative that updates and extends the story of the control of intestinal infections to developing countries — first through an understanding of the underlying mechanism of disease, then the development of a simple therapy that homemakers in remote villages could administer with readily-available materials, and finally through better ways to disinfect water in municipalities and at the household level.

These simple, inexpensive measures have had tremendous impact in developing countries by reducing infant and child mortality, promoting physical and mental growth, improving productivity, and promoting family planning. Besides telling the stories of those innovations, Dr. Gangarosa also describes his experiences at the Centers for Disease Control and Prevention establishing surveillance systems for the control of intestinal infections, his consultations with the World Health Organization in cholera outbreaks, and his efforts that set up two successful academic schools of public health.