Although the vaccine may not prevent infection altogether, it significantly reduces the severity and duration of clinical illness, including the incidence and severity of damage to the lungs. (parkridgevet.com)
And while the disease causes serious damage to the lungs, much of the damage may be reversible by the body's normal healing processes. (littlebigcat.com)
Currently available drugs can modestly improve symptoms and exercise capacity (at best), but can not repair the blood vessel damage to the lungs or cure the disease. (sciencedaily.com)