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Conceptual image of a ubiquitous virus. A ubiquitous virus is contagious in early childhood through the respiratory tract. Infection is generally asymptomatic and latent in the kidneys (but also in the lungs, tonsils, spleen, bone marrow), remaining dormant for many years and reactivating in congenital or induced immunosuppressive conditions.. (KEYSTONE/STOCKTREK IMAGES/STOCKTREK IMAGES IMAGESIMAGESImages)