Scaling up access to oral rehydration solution for diarrhea: Learning from historical experience in low- and high-performing countries.

Aim: This paper aims to identify factors that systematically predict why some countries that have tried to scale up oral rehydration solution (ORS) have succeeded, and others have not.

Methods: We examined ORS coverage over time, across countries, and through case studies. We conducted expert interviews and literature and data searches to better understand the history of ORS scale-up efforts and why they failed or succeeded in nine countries.