Question

how does the host range of a virus change

Answer 1

Answere : Host range of virus may be defined as the range or area of host infected by a virus.

The two key imoprtant event that are resposible for host range of virus is mutation and phenotype mixing.

Phenotype mixing is a phenomenon in which virus genome can intermix or interact with proteins derived from different strain. This lead to developement of new strains of viruses which may infect a new host cell.

Secondly, the mutation rate in virus is very high. The timing of phenotype expression of mutation and number of mutant produced may also very. This also lead to a narrow or braod host range for virus.