Beating the odds: Sustained Chagas disease vector control in remote indigenous communities of the Argentine Chaco over a seven-year period.

The trend toward housing improvement was also expressed in the highly significant drop in houses having tarred-cardboard roofs, from 52.9% to 31.6% over 0–78 MPS (χ 2 = 40.5, df = 2, p < 0.001), which were replaced by corrugated metal-sheet roofs ( Table 2 ).

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