Why do influenza pandemics occur? (Select all that apply)
A) a hybrid virus is produced by antigenic shift
B) no hosts have any previous immunity to the new hybrid produced by antigenic drift
C) worldwide events facilitate the movement of hosts from one continent to another
D) the human portion of a hybrid virus attacks cytotoxic T cells
Correct Answer:
Verified
Q45: A pathogen that inhibits leukocyte function as
Q46: A pathogen that inhibits leukocyte function as
Q47: Why is the Gram-negative spirochete Treponema pallidum
Q48: How does antigenic drift explain the need
Q49: Members of the protozoal genus Trypanosoma include
Q51: Match the pathogen with the part of
Q52: Infects T cells and suppresses immune system
Q53: Inhibits functions of B and T cells
Q54: Some microbes actually inhibit their own destruction
Q55: Pathogenic microbes can directly damage host cells
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