Wheezy illness in children < 2 years old.
Inflammation of small bronchioles (2mm or less, those with no cartilage) with epithelial necrosis and sloughing. They have multiple centrilobular nodules in multiple lobes on CT.
Being a child as this is a disease (mostly) of kids.
RSV (mostly), parainfluenza 1 and 3 viruses, adenoviruses, rhinoviruses, and M. pneumoniae.
See your pediatrician, I am an internist. But steroids do not help (PubMed).
There are rare cases in adults and are due to "Mycoplasma pneumoniae in eight (40.0%) patients, influenza virus in two (10.0%), influenza virus and Streptococcus pneumoniae in two (10.0%), Haemophilus influenzae in three (15.0%), and respiratory syncytial virus and rhinovirus in one (5.0%) patient" (PubMed).
In adults it leaves no long term sequela.
Last Update: 05/27/18.