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C. parvum induces the recruitment of β7-integrin-positive cells in the ileum. Immunofluorescence in 7-μm frozen ileum sections showing β7 integrin expression in wild-type neonates on day 9 p.i. (B) and their age-matched controls (A). Three-day-old mice were infected with 106 oocysts. Sections were counterstained with Evans blue. Magnification, 200×.
