Virus isolation by deep nasal swabs (12 inches) deposited into 10ml of transport medium and transported at 4<syp>0</sup>C. An antigen detection [[ELISA testing|ELISA]] should then be performed. Blood samples for serology should also be taken on day one of the disease (acute phase) and then two weeks later (convalescent stage). A 4-fold increase of haemaglutination inhibition (HI) must be shown to confirm diagnosis.
+
Virus isolation by deep nasal swabs (12 inches) deposited into 10ml of transport medium and transported at 4<sup>0</sup>C. An antigen detection [[ELISA testing|ELISA]] should then be performed. Blood samples for serology should also be taken on day one of the disease (acute phase) and then two weeks later (convalescent stage). A 4-fold increase of haemaglutination inhibition (HI) must be shown to confirm diagnosis.