Scientists from Israel’s Technion Institute have developed Liquid Foam Therapy (LIFT). It improves the distribution across the lungs of surfactant, the liquid that coats the surface of alveoli in the lungs,. COVID-19 kills the cells that secrete surfactant, making it harder to breathe.
https://www.calcalistech.com/ctech/articles/0,7340,L-3807833,00.html