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POPS Virulent form of cold virus worries experts Virulent form of cold virus worries experts suggest the emergence of a new and virulent Ad14 (adenovirus 14) variant t. Adenoviruses frequently cause acute upper respiratory tract infections like the common cold, but also can cause other illnesses including inflammation of the stomach and intestines, pink eye, bladder infection and rashes. Colds caused by adenoviruses can be very severe in the very young and the very old as well as in certain other people, like those with compromised immune systems.