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2016 ; 6
(ä): 32973
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Sterilizing immunity to influenza virus infection requires local antigen-specific
T cell response in the lungs
#MMPMID27596047
Dutta A
; Huang CT
; Lin CY
; Chen TC
; Lin YC
; Chang CS
; He YC
Sci Rep
2016[Sep]; 6
(ä): 32973
PMID27596047
show ga
Sterilizing immunity is a unique immune status, which prevents effective virus
infection into the host. It is different from the immunity that allows infection
but with subsequent successful eradication of the virus. Pre-infection induces
sterilizing immunity to homologous influenza virus challenge in ferret. In our
antigen-specific experimental system, mice pre-infected with PR8 influenza virus
through nasal route are likewise resistant to reinfection of the same strain of
virus. The virus is cleared before establishment of effective infection.
Intramuscular influenza virus injection confers protection against re-infection
with facilitated virus clearance but not sterilizing immunity. Pre-infection and
intramuscular injection generates comparable innate immunity and antibody
response, but only pre-infection induces virus receptor reduction and efficient
antigen-specific T cell response in the lungs. Pre-infection with nH1N1 influenza
virus induces virus receptor reduction but not PR8-specific T cell immune
response in the lungs and cannot prevent infection of PR8 influenza virus.
Pre-infection with PR8 virus induced PR8-specific T cell response in the lungs
but cannot prevent infection of nH1N1 virus either. These results reveal that
antigen-specific T cell immunity is required for sterilizing immunity.