True statement about influenza A is -
It has a double stranded segmented RNA
Pandemic are caused by antigenic drift
Nucelocapsid antibody is not specific
Hemagglutinin and Neuraminidase is strain specific
The viral or antigen is composed of at least two coded proteins hemagglutinins and neuraminidase. Both are strain-specific and is capable of great variation. REF:ANANTHANARAYAN AND PANIKER'S TEXTBOOK OF MICROBIOLOGY 9TH EDITION PAGE NO-498
Virology