Influenza virus can exhibit constant mutation of viral glycoproteins, called antigenic , or alternatively antigenic , which is a more serious phenomenon caused by the exchange of a viral gene with that of another influenza virus strain.

Influenza virus can exhibit constant mutation of viral glycoproteins, called antigenic , or alternatively antigenic , which is a more serious phenomenon caused by the exchange of a viral gene with that of another influenza virus strain.

i don't know. if i were you, i would search it up online : d

because they are eaten by the frog and the frog getseaten by the snake and the snake by the eagle