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Etiology and distribution of intestinal protozoa infection in patients with diarrhea among the study areas, China, 2011–2015 and 2019–2021. (A) Comparison of positivity rates of intestinal protozoan infection during 2011–2015 and 2019–2021 by protozoa; (B) Comparison of positivity rates of intestinal protozoan infection during 2011–2015 and 2019–2021 by region.
