*More serious than [[Paramyxoviridae#Parainfluenza -3 (PI-3)|PI-3]]
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*Replicates in basal epithelium -> throughout upper respiratory tract -> bronchial tree
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*Syncytia form -> shed into bronchioles
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*Complications include [[Respiratory system - ventilation#Emphysema|emphysema]] and [[Respiratory system - circulatory#Oedema|oedema]], drop in milk yield in adult cattle
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===Bovine Respiratory Syncytial Virus===
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*Bovine respiratory syncytial virus in [[Viral infections#Respiratory syncytial virus|respiratory infection]]
*Bovine respiratory syncytial virus in [[Viral infections#Respiratory syncytial virus|respiratory infection]]
*Diagnosis is same as for [[Paramyxoviridae#Parainfluenza -3 (PI-3)|PI-3]]
*Diagnosis is same as for [[Paramyxoviridae#Parainfluenza -3 (PI-3)|PI-3]]