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Aging and the response to Salmonella infection
1Department of Internal Medicine, University of Michigan Medical School, Ann Arbor.
Experimental Gerontology
|January 1, 1990
Summary
Aging impairs the febrile response and bacterial containment in Fischer 344 rats challenged with Salmonella typhimurium. Elderly rats showed reduced fever and higher bacterial loads in the liver and spleen.
Area of Science:
- Immunology
- Aging Research
- Microbiology
Background:
- The febrile response is a critical component of the innate immune system.
- Aging is associated with a decline in immune function, potentially affecting host defense against pathogens.
Purpose of the Study:
- To investigate the impact of age on the febrile response and Salmonella typhimurium infection containment in Fischer 344 rats.
Main Methods:
- Fischer 344 rats of three age groups (young, middle-aged, elderly) were inoculated with Salmonella typhimurium.
- Febrile response and bacterial counts in the liver and spleen were monitored over 13 days.
Main Results:
- Elderly rats exhibited a blunted febrile response compared to younger groups.
- Higher bacterial loads in the liver and spleen were observed in elderly rats, particularly after day 1 and day 5 post-infection.
Conclusions:
- Age-related changes in Fischer 344 rats compromise their ability to mount an effective febrile response and control Salmonella typhimurium infection.
- These findings highlight the vulnerability of aged rodents to bacterial infections, underscoring the importance of age in immune competence.