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► Health Information LibraryMononucleosis, photomicrograph of cell

Mononucleosis, photomicrograph of cell

This picture shows large, atypical lymphocytes (white blood cells). These cells are seen in viral infections, most commonly caused by the Epstein-Barr virus (infectious mononucleosis), cytomegalovirus diseases, and occasionally infectious hepatitis. This is an example of a type I Downy cell.