Disability Adjusted Life Years or DALYs means overall disease burden, taking into account both people living with a condition and people dying from a condition. 

One DALY represents one lost year of ‘healthy’ life.  DALYs are simply the sum of years of life lost due to premature mortality (YLL) and the equivalent ‘healthy’ years of life lost due to disability (YLD).

DALYs are calculated according to the formula DALY = YLL + YLD

For example, if asthma has a morbidity burden of 4121 YLDs and a mortality burden of 398 YLLs, then the overall disease burden of asthma in South Australia is 4121 + 398 = 4522 DALYs.

See  The burden of disease and injury in Australia - 2003 which measures the total burden of disease and injury in DALYs.