Table 2.

Histopathological findings

Site of tissue	Microscopic findings
Lungs	Intraalveolar edema, congestion of alveolar septal capillaries and larger vessels, septal perivascular lymphocytic infiltrate and peribronchiolar lymphocytic infiltrate, focal interalveolar exudates of macrophages admixed with lymphocytes scattered small epithelioid cell granulomas with foreign body and Langerhans types of giant cells and peripheral cuffing by lymphocytes in predominantly perivascular distribution, however, ZN stain for AFB was negative [Figure 2]
Liver	Congestion, mild chronic inflammatory infiltrate in some portal tract, and occasional lymphocytic aggregate adjacent to central vein [Figure 3a and b]
Spleen	Congestion [Figure 3c]
Brain	No pathological changes observed
Kidney	Congestion, occasional tiny focus of chronic inflammatory cells aggregate [Figure 3d]
Heart	No pathological changes observed
Tracheal tissues	Sparse submucosa and perivascular lymphocytic infiltrate mucosal epithelium shows partial autolysis [Figure 4a and b]
Salivary gland	The salivary gland shows focal sparse perivascular lymphocytic infiltrate [Figure 5a]
Epiglottis	Sparse submucosal lymphocytic infiltrate [Figure 5b and c]
Upper Oesophagus	Shows focal sparse perivascular lymphocytic infiltrate [Figure 5d]
Tongue	Follicular lymphoid hyperplasia, on its posterior aspect [Figure 4c]
Pharyngeal tissues	Edema, sparse sub mucosal lymphocytic infiltrate, and few submucosal lymphoid follicles [Figure 4d]
Tonsils	Reactive follicular hyperplasia