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13 Cards in this Set
- Front
- Back
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Body has virus how does natural defense react |
Ifn a and b produced by infected cell And Direct killing by NK cells |
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The infected virus cell produce what in response as a natural defense |
INF a and b |
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These mechanisms are important In the very early course of viral infections before immune responds. Directly kills virus infected cells |
NK cells |
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How does the immune respond to viruses ? |
Combo two mechanisms humoral and cell mediated |
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Viruses humoral response |
Specific antibody basis for immunity in early infection in resp and gi related viruses IgA secretory immunity |
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What is positive importance of early humoral immune response early in the virus infection |
Provides long lasting protection after infection has cleared |
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Virus associated humoral immunity a target for what kind of vaccines |
Oral |
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How can virus humoral immune response damage tissue? |
Circulating immune complexes ag-an may lodge in blood vessels and initiate c mediated tissue damage |
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What is the principle mechanism for combating established viral infections |
Cytotoxic t lymphocytes |
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What do Tc cells do to curb viral infections |
Directly kill virus infected cells once virus has been established |
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May be responsible for tissue injury in non cytopathic virus infections |
Tc cells |
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Evasion of immune response most obvious mechanism |
Intracellular persistence |
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Some mechanisms that viruses use to evade host defenses |
Antigen variation Direct suppression of immune response |
