**Replicates in nasal epithelium -> throughout upper respiratory tract -> bronchial tree
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**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
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*'''Epidemiology''':
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**Subclinical reinfections are important in spreading disease
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**More than 70% of cattle in the UK have antibodies to BRSV
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*'''Diagnosis''' is same as for [[Paramyxoviridae#Parainfluenza -3 (PI-3)|PI-3]]
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*'''Control'''
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**Improve husbansry as in [[Paramyxoviridae#Parainfluenza -3 (PI-3)|PI-3]]
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**Vaccines are available but not effective as need to stimulate [[Lymphocytes - WikiBlood#Cytotoxic CD8+|cytotoxic T-cells]]