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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)
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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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)
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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