Table 1. Histopathologic findings of lung necropsies in 15 Iranian patients .

Characteristics	Frequency	Percent
Lymphocytic infiltration	Less than 25% (+1) in necropsy samples	6	40.0
	25%-50% (+2) in necropsy samples	8	53.3
	More than 50% (+3) in necropsy samples	1	6.7
Location of Infiltrate	Alveolar septa	6	40.0
	Alveolar septa+perivascular	9	60.0
Microthrombi	Absent	12	80.0
	Present	3	20.0
Anthracosis	Absent in necropsy samples	2	13.3
	Less than 25% (+1) in necropsy samples	10	66.7
	25%-50% (+2) in necropsy samples	3	20.0
Desquamated type2 pneumocytes	Absent in necropsy samples	4	26.7
	Less than 25% (+1) in necropsy samples	6	40.0
	25%-50% (+2) in necropsy samples	3	20.0
	More than 50% (+3) in necropsy samples	2	13.3
Viral inclusion cytopathic effects	Absent	11	73.3
	Present	4	26.7
Hyaline membrane changes	Absent in necropsy samples	3	20.0
	Less than 25% (+1) in necropsy samples	6	40.0
	25%-50% (+2) in necropsy samples	4	26.7
	More than 50% (+3) in necropsy samples	2	13.3
Fibrindeposition	Absent in necropsy samples	4	26.7
	Less than 25% (+1) in necropsy samples	8	53.3
	25%-50% (+2) in necropsy samples	3	20.0
Alveolar Capillaries	Inflammation, edema	2	13.3
	Inflammation, edema and thrombosis	1	6.7
	Surrounded with edema	10	66.6
	surrounded with edema &PMN infiltration	1	6.7
	surrounded with edema+fibrous thickening	1	6.7
Megakaryocytes	Absent	5	33.3
	less than 3 in whole slide	7	46.7
	≥3 in whole slide	3	20.0
PMN in wall	Mild or focal	12	80.0
	Moderate	2	13.3
	Severe	1	6.7
Septal necrosis	Absent	12	80.0
	Extensive	1	6.7
	Focal	2	13.3
Microabscess	Absent	13	86.7
	Extensive	1	6.7
	Focal	1	6.7
Bacterialcolonies	Negative	14	93.3
	Present	1	6.7