<prompt> SARS true are -Severe acute respiratory syndromeDocumented respiratory route spreadEffective vaccine availableCause atypical pneumonitis  <response>: The pathophysiology of acute respiratory distress syndrome involves fluid accumulation in the lungs not explained by hea failure noncardiogenic pulmonary edema. Of these, the pathology most associated with ARDS is DAD, which is characterized by a diffuse inflammation of lung tissue. Ref Harrison20th edition pg 1059 