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It found evidence of “severe bilateral acute pulmonary edema” and “frothy pulmonary edema in trachea and mainstem bronchi.”

However, it rarely affects the bronchi and alveoli in the lungs.

In severe asthma, the bronchi become chronically inflamed and constricted.

R.S.V. predominantly affects the small airways, called bronchioles, that branch off from bronchi in the lungs.

The researchers also infected tissue from the bronchi, the tubes in the upper chest that deliver air from the windpipe to the lungs.