Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Increases in prevalence/severity of asthma (reversible airway obstruction) could occur because of changes in different parts of the hypersensitivity and inflammatory response in the lungs. The Roman numerals refer to the three hypotheses in Box 1.
