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**Alveolar septa become infiltrated by lymphocytes and macrophages
**Alveolar septa become infiltrated by lymphocytes and macrophages
**Smooth muscle hypertrophy
**Smooth muscle hypertrophy
**PM: lungs are heavy, rubbery and do not collapse (for more, see [[Respiratory Viral Infections - Pathology#Maedi Visna|here]])
**PM: lungs are heavy, rubbery and do not collapse
*All result in loss of condition
*All result in loss of condition
*Infected animals remain antibody and virus positive
*Infected animals remain antibody and virus positive