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Sampling frame and screening results. Sampled provinces are colored according to geographic region (as per the legend). Dots indicate the location of sampled health facilities. A single facility was sampled in each province, except for Guayas (four facilities) and Pichincha (two facilities) provinces in Guayaquil and Quito cities, respectively. The number of seropositive mothers and the sample size for each province are indicated by fractions. Uncolored provinces were not sampled.
