Related Experiment Video
Updated: Aug 5, 2026
10:13
Assessment of Age-related Changes in Cognitive Functions Using EmoCogMeter, a Novel Tablet-computer Based Approach
Published on: February 14, 2014
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
Summary
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.
Related Concept Videos
01:26Factors Affecting the Risk of Infection
The hosts' susceptibility to infection depends on several factors. The integrity of the skin and mucous membranes helps protect the body against microbial attacks. When the skin is altered, the chance of infection, limb loss, and even death increases.
The integrity and count of the white blood cells help the body resist pathogens and fight infection. When impaired, it reduces the body's resistance to pathogens. The acidic pH levels of the gastrointestinal, genitourinary tracts, and skin create...
The integrity and count of the white blood cells help the body resist pathogens and fight infection. When impaired, it reduces the body's resistance to pathogens. The acidic pH levels of the gastrointestinal, genitourinary tracts, and skin create...
01:30Cognitive Development During Adulthood
Cognitive development continues throughout adulthood, undergoing significant shifts across early, middle, and late stages. Individual transition occurs from adolescent idealism to pragmatic and adaptable thinking in early adulthood. During this period, individuals learn to integrate personal beliefs with the recognition that other perspectives are equally valid. Exposure to the complexities of modern society, diverse experiences, and higher education contribute to this adaptive thought process,...
01:30Development of Human Microbiota
The human microbiota begins developing at birth and undergoes continual change as we age. Infancy marks a critical period of microbial sensitivity, offering a “window of opportunity” during which beneficial microbes help mature the immune system. By age three, children typically develop a more stable and diverse microbial community. Newborns acquire microbes from their immediate environment; vaginal delivery favors maternal vaginal microbes, while cesarean births favor microbes from the skin...
01:29Alzheimer Disease l: Introduction
Alzheimer disease is a chronic, progressive, and irreversible neurodegenerative disorder and the most common cause of dementia in older adults. It leads to gradual neuronal loss, causing cognitive decline, behavioral changes, and loss of functional independence.Risk Factors and EtiologyThe disease is multifactorial. Age is the strongest risk factor, with prevalence doubling every 5 years after age 65. Genetic factors include mutations in genes such as APP, PSEN1, and PSEN2, which are associated...
01:22Dementia l: Introduction
Dementia is an acquired, progressive syndrome characterized by a decline in multiple cognitive domains severe enough to impair daily functioning and reduce independence. Although memory loss is a central feature, the diagnosis requires additional deficits involving language, executive function, visuospatial skills, judgment, calculation, or abstract reasoning. These cognitive impairments reflect underlying neurodegenerative or vascular processes that gradually disrupt neuronal networks...
01:29Hepatic Encephalopathy
DefinitionHepatic encephalopathy is a reversible neurologic syndrome that results from advanced liver dysfunction or portosystemic shunting. It leads to disturbances in cognition, behavior, and motor function due to the brain’s exposure to gut-derived toxins that the liver fails to detoxify.EtiologyThis condition develops either in the setting of acute fulminant hepatitis or progressively during chronic liver disease, such as cirrhosis and portal hypertension. Portosystemic shunting—including...