*Replicates in nasal epithelium -> throughout upper respiratory tract -> bronchial tree
*Replicates in nasal epithelium -> throughout upper respiratory tract -> bronchial tree
*Syncytia form -> shed into bronchioles
*Syncytia form -> shed into bronchioles
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*Complications include [[Lungs Ventilation - Pathology#Emphysema|emphysema]] and [[Lungs Circulatory - Pathology#Pulmonary oedema|oedema]], drop in milk yield in adult cattle
+
*Complications include [[Lungs Ventilation - Pathology#Emphysema|emphysema]] and [[Pulmonary Oedema|oedema]], drop in milk yield in adult cattle