The Melbourne epidemic thunderstorm asthma event 2016: a 5-year longitudinal study.

This is the longest documented follow-up of ETSA-affected individuals. Five years following sentinel event, there was progressive reduction but some persistence in asthma symptoms. Oralair allergen immunotherapy did not further improve allergic rhinitis or asthma symptoms compared to control, but there were no further ETSA events to test a protective effect during the study period.