antigenic drift वाक्य
उदाहरण वाक्य
मोबाइल
- This limited host and range is apparently responsible for the lack of Influenzavirus B-caused influenza pandemics in contrast with those caused by the morphologically similar Influenzavirus A as both mutate by both antigenic drift and reassortment.
- The challenges for researchers have been identifying single antibodies that could neutralize many subtypes of the virus, so that they could be useful in any season, and that target conserved domains that are resistant to antigenic drift.
- Between primary and secondary infections, or following vaccination, a virus may undergo antigenic drift, in which the viral surface proteins ( the epitopes ) are altered through natural mutation, allowing the virus to escape the immune system.
- Nancy Arden, an epidemiologist at the U . S . Centers for Disease Control and Prevention in Atlanta, said that in addition to the ongoing " antigenic drift " process, influenza occasionally appears in a dramatically new form.
- Antigenic shift is contrasted with antigenic drift, which is the natural mutation over time of known strains of influenza ( or other things, in a more general sense ) which may lead to a loss of immunity, or in vaccine mismatch.
- A new vaccine is required every year because influenza virus has the ability to undergo antigenic drift . Antigenic shift occurs periodically when the genes for structural proteins are acquired from other animal hosts resulting in a sudden dramatic change in viral genome.
- "' Robert Gordon ( " Rob " ) Webster "'( born 7 May 1932 in genetic segments ( antigenic shift ) between viruses in humans and nonhumans ( especially birds ) rather than by mutations ( antigenic drift ) in annual human flu strains.
- With no segments, nothing can be mixed with one another and so there is no antigenic shift . The second reason relates to the idea of antigenic drift . Since RNA dependent RNA polymerase does not have an error checking function, many mutations are made when the RNA is processed.
- Until recently, such combinations were believed to have caused the infamous Spanish Flu outbreak of 1918 which killed 40 ~ 100 million people worldwide; however more recent research suggests the 1918 pandemic was caused by the antigenic drift of a fully avian virus to a form that could infect humans efficiently.
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