*[[Nasal Cavity Inflammatory - Pathology#Infectious causes of rhinitis|Rhinitis]],
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*Pathogenesis:
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**Inhalation -> replication in epithelial cells of upper and lower airways (attaches via haemaglutinin spike and gains entry into cell) -> neuramidase alters efficiency of [[Respiratory System General Introduction - Pathology#Mucociliary escalator|mucociliary apparatus]]
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*Sloughing of the affected area
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*Severity of signs will depend on dose of virus
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*Acute [[Trachea Inflammatory - Pathology#Infectious causes of tracheitis|tracheo]][[Bronchi and Bronchioles Inflammatory - Pathology#Infectious causes of bronchitis or bronchiolitis|bronchitis]] with coughing, and fever
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*May be accompanied by secondary bacterial infections
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*No viraemia
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*In severe cases may cause [[Lungs Inflammatory - Pathology#Bronchointerstitial pneumonia|bronchointerstitial pneumonia]]
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*Secondary invaders are usually [[:Category:Streptococcus species|''Streptococci'']]