How severe is a two year old with puen.?? My sister just called me in hysterics because her little guy was admitted to hospital. The nurses are trying to put an i.V in his arm, and he is totally loosing it. He has had quite a high fever for a couple of days now, accompanied by vomitting. She thought is was just the flu, as it is going around now. She took him over to the hospital, and they did blood work, and it came back pneumonia. She is loosing her mind!