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As it is known that with age, circulating testosterone levels decline in males, we hypothesized that reduced testosterone contributes to age-associated increases in influenza severity. A murine model was used to test this hypothesis. As in men, testosterone concentrations were lower in aged (18 mo) than young (2 mo) male C57BL\/6 mice. Following inoculation with influenza A virus (IAV), aged males experienced greater morbidity, clinical disease, and pulmonary inflammation than young males, and had lower neutralizing and total anti-influenza IgG antibody responses. Peak titers of virus in the lungs did not differ between aged and young males, but virus clearance was delayed in aged males. In young males, removal of the gonads increased\u2014whereas treatment of gonadectomized males with testosterone reduced\u2014morbidity, clinical illness, and pulmonary pathology, but viral replication was not altered by hormone manipulation in young males. Treatment of aged males with testosterone improved survival following infection but did not alter either virus replication or pulmonary pathology. These results indicate that low concentrations of testosterone, whether induced surgically in young males or naturally occurring in aged males, negatively impact the outcome of influenza. <\/jats:p>","DOI":"10.1152\/ajplung.00352.2016","type":"journal-article","created":{"date-parts":[[2016,11,4]],"date-time":"2016-11-04T22:49:24Z","timestamp":1478299764000},"page":"L1234-L1244","source":"Crossref","is-referenced-by-count":70,"title":["Age and testosterone mediate influenza pathogenesis in male mice"],"prefix":"10.1152","volume":"311","author":[{"given":"Landon G.","family":"vom Steeg","sequence":"first","affiliation":[{"name":"W. 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