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Distribution of Cryptosporidium parvum subtype families in humans in Asia, Africa, Europe, Oceania, the Middle East, South America, and North America. Numbers above bars denote sample size (n). In the bars, “a,” “b,” and “c” indicate a significant difference in distribution of IIa, IIc, and IId between Asia and the group under comparison (P < 0.05 by chi-square test), respectively.
