Cytomegalovirus-associated protracted diarrhoea in an immunocompetent boy

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Abstract

Aim

Cytomegalvirus (CMV) gastroenteritis is rarely described in immunocompetent children. We describe here an immunocompetent 1-year-old boy with CMV-associated protracted diarrhoea and discuss the pathogenesis of CMV infection of the gastrointestinal tract.

Methods

Immunohistochemical study was performed using a gastric and duodenal tissue of this patient. Furthermore, the detection of CMV-DNA in stool and urine samples was performed by polymerase chain reaction method.

Results

CMV infection was proven by the detection of CMV-DNA in stool and urine samples and CMV-positive cells in the immunoperoxidase preparation from gastroduodenal biopsy. The biopsy specimens showed severe chronic active gastroduodenitis with numerous CD3+ T cells and CD68+ macrophages.

Conclusions

We speculated from these findings that CMV invasion of the mucosal layer induced an intense immune response characterised by massive infiltration of activated T-cells and macrophages in this patient. Although the pathogenesis of CMV-associated gastroenteritis in immunocompetent hosts remains generally unknown, immune mechanism may play some roles in generating the chronic inflammatory lesions.

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