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- W2059330151 abstract "Background Pneumonia and pulmonary infections are major causes of mortality among the growing elderly population. Age associated attenuations of various immune parameters, involved with both innate and adaptive responses are collectively known as immune senescence. These changes are likely to be involved with differences in host susceptibility to disease between young and aged individuals. Methodology/Principal Findings The objective of this study was to assess potential age related differences in the pulmonary host response in mice to the Gram-negative respiratory pathogen, Francisella novicida. We intranasally infected mice with F. novicida and compared various immune and pathological parameters of the pulmonary host response in both young and aged mice. Conclusions/Significance We observed that 20% of aged mice were able to survive an intranasal challenge with F. novicida while all of their younger cohorts died consistently within 4 to 6 days post infection. Further experiments revealed that all of the aged mice tested were initially able to control bacterial replication in the lungs as well as at distal sites of replication compared with young mice. In addition, the small cohort of aged survivors did not progress to a severe sepsis syndrome with hypercytokinemia, as did all of the young adult mice. Finally, a lack of widespread cell death in potential aged survivors coupled with a difference in cell types recruited to sites of infection within the lung confirmed an altered host response to Francisella in aged mice." @default.
- W2059330151 created "2016-06-24" @default.
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- W2059330151 date "2010-11-23" @default.
- W2059330151 modified "2023-10-16" @default.
- W2059330151 title "Attenuated Response of Aged Mice to Respiratory Francisella novicida Is Characterized by Reduced Cell Death and Absence of Subsequent Hypercytokinemia" @default.
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- W2059330151 doi "https://doi.org/10.1371/journal.pone.0014088" @default.
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