Transient neonatal Cryptosporidium parvum infection triggers long-term jejunal hypersensitivity to distension in immunocompetent rats.

In 5-day-old immunocompetent Sprague-Dawley rats infected with either 10(2) or 10(5) Cryptosporidium parvum oocysts, transient infection resulted 120 days later in increased cardiovascular depressor response to jejunal distension and jejunal myeloperoxidase activity (P < 0.05). Nitazoxanide treatment normalized jejunal sensitivity (P < 0.001) but not myeloperoxidase levels (P > 0.05). Data warrant further evaluation of the role of early cryptosporidiosis in the development of chronic inflammatory gut conditions.