antigenic drift meaning in Hindi

Examples

1. H9N2 viruses isolated from chickens in China showed antigenic drift that evolved into distinct antigenic groups.
2. Antigenic drift occurs in both and viruses.
3. One is called " antigenic drift, " which is small hanges that take place in the virus.
4. Influenza virus C is only capable of antigenic drift whereas type A undergo antigenic shift, as well.
5. The conserved epitopes are common to most human flu virus strains regardless of their antigenic drift and shifts.
6. Antigenic drift creates influenza viruses with slightly modified antigens, while antigenic shift generates viruses with entirely novel antigens.
7. All influenza viruses experience some form of antigenic drift, but it is most pronounced in the influenza A virus.
8. This antigenic drift may have led to immunization failure and may explain the current prevalence of the H9N2 influenza virus in China.
9. Glycoproteins may undergo mutations ( antigenic drift ) or reassortment in which a new HA or NA is produced ( antigenic shift ).
10. To meet the challenge of antigenic drift, vaccines that confer broad protection against heterovariant strains are needed against seasonal, epidemic and pandemic influenza.