Enterovirus D-68 is a virus similar to polio in deadliness, but not in symptoms. Enterovirus -D68 is a respiratory illness characterized by flu-like symptoms with varying fevers, chills, changes in apetite, and fluid in the lungs. There is an added symptom of destroying the immune system entirely within 5-8 weeks which results in death. So far, there have about 2,000 deaths of exclusively asthmatic children throughout the United States.
In young children, the treatment is similar to that of RSV. There is very little to do except monitor their liquids, and if their fevers are too high, take them in to the emergency room.
There are about a dozen illnesses that have similar symptoms, all of which have no treatment. So far, EV-D68 is the deadliest in the United States.