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Boe, D. M.; Boule, L. A.; Kovacs, E. J.
Clinical and experimental immunology, January 2017, Volume: 187, Issue: 1Journal Article
Summary The world is undergoing an unprecedented shift in demographics, with the number of individuals over the age of 60 years projected to reach 2 billion or more by 2050, representing 22% of the global population. Elderly people are at a higher risk for chronic disease and more susceptible to infection, due in part to age‐related dysfunction of the immune system resulting from low‐grade chronic inflammation known as ‘inflamm‐ageing’. The innate immune system of older individuals exhibits a diminished ability to respond to microbial threats and clear infections, resulting in a greater occurrence of many infectious diseases in elderly people. In particular, the incidence of and mortality from lung infections increase sharply with age, with such infections often leading to worse outcomes, prolonged hospital stays and life‐threatening complications, such as sepsis or acute respiratory distress syndrome. In this review, we highlight research on bacterial pneumonias and pulmonary viral infections and discuss age‐related changes in innate immunity that contribute to the higher rate of these infections in older populations. By understanding more clearly the innate immune defects in elderly individuals, we can design age‐specific therapies to address lung infections in such a vulnerable population. The elderly are a growing demographic at high risk for respiratory infections due to innate immune dysfunction in the lungs. In this review, we examine research on age‐related changes in the response of the innate immune system to pulmonary infections.
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