s new to me also that asthma causes a 103 degree fever! Asthma can lead
to pneumonia but not the other way around.
When steroids are inhaled into the lungs
to treat asthma it creates an immune suppression and can make the person more susceptible to infection.
This is a scary thing for a mother not to mention your son and should be investigated further. I would recommend they refer you to a Immunologist,and have the level of antibodies your son has evaluated.