Impact of cross-protective vaccines on epidemiological and evolutionary dynamics of influenza.

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Title: Impact of cross-protective vaccines on epidemiological and evolutionary dynamics of influenza.
Authors: Arinaminpathy, Nimalan1, Ratmann, Oliver2,3, Koelle, Katia2,4, Epstein, Suzanne L.5, Price, Graeme E.5, Viboud, Cecile4, Miller, Mark A.4, Grenfell, Bryan T.1,4
Source: Proceedings of the National Academy of Sciences of the United States of America. 2/21/2012, Vol. 109 Issue 8, p3173-3177. 5p.
Subjects: Communicable disease immunology, Measles vaccines, Vaccination, Smallpox vaccines, Influenza vaccines, Immunization, Epidemiology
Abstract: Large-scale immunization has profoundly impacted control of many infectious diseases such as measles and smallpox because of the ability of vaccination campaigns to maintain long-term herd immunity and, hence, indirect protection of the unvaccinated. In the case of human influenza, such potential benefits of mass vaccination have so far proved elusive. The central difficulty is a considerable viral capacity for immune escape; new pandemic variants, as well as viral escape mutants in seasonal influenza, compromise the buildup of herd immunity from natural infection or deployment of current vaccines. Consequently, most current influenza vaccination programs focus mainly on protection of specific risk groups, rather than mass prophylactic protection. Here, we use epidemiological models to show that emerging vaccine technologies, aimed at broad-spectrum protection, could qualitatively alter this picture. We demonstrate that sustained immunization with such vaccines could-through potentially lowering transmission rates and improving herd immunity-significantly moderate both influenza pandemic and seasonal epidemics. More subtly, phylodynamic models indicate that widespread cross-protective immunization could slow the antigenic evolution of seasonal influenza; these effects have profound implications for a transition to mass vaccination strategies against human influenza, and for the management of antigenically variable viruses in general. [ABSTRACT FROM AUTHOR]
Copyright of Proceedings of the National Academy of Sciences of the United States of America is the property of National Academy of Sciences and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Impact of cross-protective vaccines on epidemiological and evolutionary dynamics of influenza.
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  Data: <searchLink fieldCode="DE" term="%22Communicable+disease+immunology%22">Communicable disease immunology</searchLink><br /><searchLink fieldCode="DE" term="%22Measles+vaccines%22">Measles vaccines</searchLink><br /><searchLink fieldCode="DE" term="%22Vaccination%22">Vaccination</searchLink><br /><searchLink fieldCode="DE" term="%22Smallpox+vaccines%22">Smallpox vaccines</searchLink><br /><searchLink fieldCode="DE" term="%22Influenza+vaccines%22">Influenza vaccines</searchLink><br /><searchLink fieldCode="DE" term="%22Immunization%22">Immunization</searchLink><br /><searchLink fieldCode="DE" term="%22Epidemiology%22">Epidemiology</searchLink>
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  Data: Large-scale immunization has profoundly impacted control of many infectious diseases such as measles and smallpox because of the ability of vaccination campaigns to maintain long-term herd immunity and, hence, indirect protection of the unvaccinated. In the case of human influenza, such potential benefits of mass vaccination have so far proved elusive. The central difficulty is a considerable viral capacity for immune escape; new pandemic variants, as well as viral escape mutants in seasonal influenza, compromise the buildup of herd immunity from natural infection or deployment of current vaccines. Consequently, most current influenza vaccination programs focus mainly on protection of specific risk groups, rather than mass prophylactic protection. Here, we use epidemiological models to show that emerging vaccine technologies, aimed at broad-spectrum protection, could qualitatively alter this picture. We demonstrate that sustained immunization with such vaccines could-through potentially lowering transmission rates and improving herd immunity-significantly moderate both influenza pandemic and seasonal epidemics. More subtly, phylodynamic models indicate that widespread cross-protective immunization could slow the antigenic evolution of seasonal influenza; these effects have profound implications for a transition to mass vaccination strategies against human influenza, and for the management of antigenically variable viruses in general. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Proceedings of the National Academy of Sciences of the United States of America is the property of National Academy of Sciences and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1073/pnas.1113342109
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        Text: English
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        Type: general
      – SubjectFull: Measles vaccines
        Type: general
      – SubjectFull: Vaccination
        Type: general
      – SubjectFull: Smallpox vaccines
        Type: general
      – SubjectFull: Influenza vaccines
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      – SubjectFull: Immunization
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      – SubjectFull: Epidemiology
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      – TitleFull: Impact of cross-protective vaccines on epidemiological and evolutionary dynamics of influenza.
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              Text: 2/21/2012
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