Variations

Question 1

Describe antigenic shift

Answer 1

two or more diff strains of a virus infecting a single host organism;

mixing and reassortment of virus genome;

new combination of virus genome;

which is a mixture of genome from two or more strains;

surface glycoproteins expressed is a mixture of two or more strains;

formation of a new strain of virus;

infect more than one host organism due to new viral surface glycoproteins

Question 2

Describe antigenic drift

Answer 2

accumulation of mutations within genes that code surface glycoproteins;

gradual change in shape and structure of the surface glycoproteins;

formation of a new strain virus;

infect another host organism to increase viral reservoir