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Cognitive impairment and infectious burden in the elderly

T E Strandberg1, K H Pitkala, K Linnavuori

  • 1Department of Medicine, Geriatric Clinic, and Department of Virology, University of Helsinki, FIN-00029 HUS, Helsinki, Finland. timo.strandberg@hus.fi

Archives of Gerontology and Geriatrics. Supplement
|June 23, 2004
PubMed

Insights

Viral infections, including herpes simplex virus and cytomegalovirus, are linked to cognitive decline in the elderly. This association suggests a potentially preventable cause for dementia, highlighting the importance of managing viral burden.

Area of Science:

  • Gerontology
  • Infectious Diseases
  • Neuroscience

Background:

  • Infectious agents are implicated in dementia, particularly Alzheimer's disease.
  • Understanding the role of viral and bacterial infections in cognitive impairment is crucial for public health.

Purpose of the Study:

  • To investigate the association between viral/bacterial seropositivity and cognitive impairment in elderly individuals with vascular disease.
  • To determine if increased viral or bacterial burden correlates with cognitive decline over time.

Main Methods:

  • A cohort of 383 home-dwelling elderly individuals (mean age 80) with vascular disease was studied.
  • Viral (HSV1, HSV2, CMV) and bacterial (C. pneumoniae, M. pneumoniae) seropositivity were assessed.
  • Cognitive function was evaluated using the Mini-Mental State Examination (MMSE) at baseline and 12-month follow-up.

Main Results:

  • Higher viral burden correlated with lower MMSE scores at baseline (p=0.03).
  • Cognitive impairment (MMSE < 24) at baseline was significantly associated with seropositivity for 3 viruses (RR 2.5).
  • Increased viral burden (2-3 seropositivities) was associated with greater MMSE score decline during 12-month follow-up (RR 1.8-2.3).
  • No significant association was found between bacterial burden and cognitive function.

Conclusions:

  • Increased viral burden, specifically from herpes viruses and cytomegalovirus, is associated with cognitive impairment and decline in elderly individuals.
  • This viral association may represent a modifiable risk factor for cognitive decline, offering potential avenues for prevention.

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