Current flu vaccines are produced to counter the influenza strains that the World Health Organization predicts will dominate a particular flu season. Inoculation typically focuses on protecting people who are vulnerable to the virus. However, this approach does not provide long-term or widespread immunity, Arinaminpathy said. The flu virus is always evolving, and so vaccines need to be updated each year.
The reason is that these vaccines zero in on hemagglutinin (HA), proteins protruding from the virus' surface that allow it to attach to and invade host cells. Small mutations in these highly adaptive appendages can create new versions of the virus that often are invulnerable to the vaccine designed for their former selves, a tactic known as "immune escape."
Universal vaccines instead bypass the protruding HA surface to target more constant proteins with less evolutionary flair, Arinaminpathy said. Because HAs are still active, the virus may still infect people, but it cannot wreak the same havoc.
The various universal vaccines being developed target different viral components, but they all have the potential to slow viral transmission across many flu variants, Arinaminpathy said. The researchers used that overarching feature in their model vaccine. The researchers then simulated the effectiveness of their basic universal vaccine in two types of flu outbreak: pandemic and epidemic.
A flu pandemic the sudden and rapid spread of a new, highly contagious strain is difficult to predict and typically imposs
|Contact: Morgan Kelly|