The genetic change that enables a flu strain to jump from one animal species to another, including humans, is called "ANTIGENIC SHIFT." Antigenic shift can happen in three ways:
The genetic change that enables a flu strain to jump from one animal species to another, including humans, is called "ANTIGENIC SHIFT." Antigenic shift can happen in three ways:
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:The genetic change that enables a flu strain to jump from
one animal species to another, including humans, is called "ANTIGENIC SHIFT."
Antigenic shift can happen in three ways:
The new strain
may further
evolve to spread
from person to
person. If so, a
flu pandemic
could arise.
B Without
undergoing
Bird influenza A strain genetic change,
a bird strain of
influenza A can
jump directly
from a duck
or other aquatic
Bird host
bird to
humans.
НА
NA
antigen
antigen
Human influenza A strain
Human
host
A-1 A duck or other
aquatic bird passes a bird
strain of influenza A to
an intermediate host
Without
undergoing
genetic change,
a bird strain of
influenza A
such as a chicken or pig.
can jump
directly from a
duck or other
A-2 A person passes a
human strain of
influenza A to the
НА
NA
antigen -
antigen
aquatic bird to
an intermediate
animal host and
same chicken or pig. (Note that reassortment can
occur in a person who is infected with two flu strains.)
then to humans.
A-3 When the viruses infect the same cell,
the genes from the bird strain mix
with genes from the human
strain to yield a new strain.
Viral entry
intermediate host cell
A-4
The new strain
can spread
from the
New influenza
strain
intermediate
host to
humans.
ASE
Intermediate
- host cell
Genetic mixing
Link Studio for NIAID
Intermediate
host (pig)
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