antigenic

This influenza virus, like all influenza viruses, can mutate via a process called antigenic drift, which can make it either more or less virulent.

Avoiding the swine flu | The Blog of Michael R. Eades, M.D. 2009

New viral strains arise through a process called antigenic shift, or reassortment, when at least two viruses combine.

Scientists Fear People Spread New Swine Flu 2009

These changes, known as antigenic shifts, can sometimes result in very deadly strains.

Influenza Glossary 2008

These errors, which result in what is called antigenic drift, explain why the flu virus is different each season and why new vaccines are needed each year.

Influenza Glossary 2008

These small changes in the virus are called antigenic drift, and over time changes in the virus can accumulate to the point that last year's vaccine is no longer effective.

Avian Flu Diary Michael Coston 2010

Only the influenza Type-A virus is capable of what is known as antigenic shift.

WN.com - Articles related to First flu virus detector in JDWNRH 2010

One area of hemagglutinin, especially, known as antigenic site Sa, appears highly similar between the 2009 and 1918 strains of influenza.

Medlogs - Recent stories 2010

Only the influenza Type-A virus is capable of what is known as antigenic shift.

WN.com - Articles related to First flu virus detector in JDWNRH 2010

One area of hemagglutinin, especially, known as antigenic site Sa, appears highly similar between the 2009 and 1918 strains of influenza.

BusinessWeek.com -- 2010

These small changes in the virus are called antigenic drift, and over time changes in the virus can accumulate to the point that last year's vaccine is no longer effective.

Avian Flu Diary Michael Coston 2010