Adenovirus Infection

 Symptoms and signs resemble those of a cold (cough, runny nose, mild fever) for about three to five days; the majority of people clear the disease, but up to about 40% may need hospitalization with severe symptoms of pneumonia, and shortness of breath; other organ related symptoms may develop such as eye, bladder, and GI problems. There is no adenovirus-specific therapy and the infection usually resolves by itself. 

 According to a study in Canada,  71% occurred in children <2 years of age, and 94% occurred in children <5 years of age.