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Related Concept Videos

Primary Healthcare Services01:30

Primary Healthcare Services

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Primary care promotes wellness and prevents disease. This care includes health promotion, education, protection (such as immunizations), early disease screening, and environmental considerations. Settings providing this type of healthcare include physician offices, public health clinics, school nursing, and community health nursing.
In 1978, international leaders convened in Alma-Ata, Kazakhstan, for what would be a pivotal event in global health. The Alma-Ata Declaration was the first to call...
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Levels of Health Promotion and Illness Prevention01:26

Levels of Health Promotion and Illness Prevention

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Health promotion allows a person to control the determinants of health, resulting in an improved health status. It enhances the quality of life and reduces premature deaths. Health promotion and illness prevention programs help people make beneficial choices to reduce the risk of disease and disabilities. There are three health promotion and illness prevention levels: primary, secondary, and tertiary prevention.
In primary prevention, actions taken before disease onset prevent the disease from...
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Preventive Healthcare Services01:30

Preventive Healthcare Services

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Preventive healthcare services keep people healthy via frequent check-ups, screening, and counseling. They primarily aid in disease prevention rather than treating an acute or chronic illness. Preventive treatment also keeps individuals productive and energetic, allowing them to work well into their retirement years. Examples of preventive care services include:
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Principles of Disease Surveillance01:26

Principles of Disease Surveillance

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Disease surveillance is the systematic collection, analysis, and interpretation of health data essential to the planning, implementation, and evaluation of public health practice. This process integrates data dissemination to entities responsible for preventing and controlling disease, injury, and disability. Surveillance systems provide crucial information for action, helping public health authorities make informed decisions to manage and prevent outbreaks, ensure public safety, optimize...
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Healthcare Agencies II01:17

Healthcare Agencies II

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There are various healthcare agencies in the United States—some of which are managed by religious institutions and others by different government branches.
Parish nursing is a growing specialty nursing profession that focuses on holistic healthcare, health promotion, and illness prevention. It blends professional nursing practice with a health ministry, focusing on health and healing within the context of a Christian community. Parish nurses serve as health educators, referral sources,...
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Methods Of Healthcare Delivery System01:26

Methods Of Healthcare Delivery System

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At the different levels of the healthcare system, we see varying methods of healthcare used. These methods include managed care systems, case management, and primary healthcare.
Managed Care System:
The managed care system is designed to control the cost while maintaining the quality of care. The patient's care from admission to discharge is planned by the primary care provider or the case manager, also known as the gatekeeper. In a managed care system, the number of care providers is...
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Determining Soil-transmitted Helminth Infection Status and Physical Fitness of School-aged Children
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Public Health.

Sophie Lefèvre-Arbogast1,2,3, Pierre Scala4, Aurore Zorilla5

  • 1Bordeaux Population Health Research Center, Inserm U1219, University of Bordeaux, Bordeaux, NA, France.

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|December 23, 2025
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Summary
This summary is machine-generated.

Low-level exposure to Persistent Organic Pollutants (POPs) like PCBs and OCPs did not significantly increase dementia risk in older adults. However, APOE-ɛ4 carriers showed adverse effects from specific highly-chlorinated PCBs.

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Area of Science:

  • Environmental Health
  • Neuroscience
  • Gerontology

Background:

  • Persistent Organic Pollutants (POPs), including polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs), are known neurotoxicants.
  • The impact of low-grade environmental POP exposure on brain aging pathologies in the general population remains unclear.

Purpose of the Study:

  • To assess prospective associations between plasma POP concentrations and dementia-related outcomes in older adults.
  • Investigate the relationship between POPs, cognitive function, and medial temporal lobe (MTL) volume.

Main Methods:

  • Utilized data from 515 participants in the French Three-City Study, with repeated cognitive assessments and neuroimaging over 17 and 10 years, respectively.
  • Measured plasma concentrations of 12 OCPs and 15 PCBs; derived a POP score.
  • Analyzed associations with dementia risk, cognitive decline, and MTL atrophy using Cox and linear mixed models, adjusting for covariates.

Main Results:

  • No significant associations were found between overall POP exposure (individual POPs or POP score) and dementia risk, cognitive decline, or MTL atrophy.
  • Significant interactions between APOE genotype and highly-chlorinated PCBs (congeners 180, 194, 196-203) were observed.
  • APOE-ɛ4 carriers exposed to specific PCBs showed increased dementia risk and accelerated cognitive decline/MTL atrophy, while non-carriers showed opposing trends.

Conclusions:

  • This study found no robust evidence linking low-grade environmental POP exposure to increased risk of dementia, cognitive decline, or brain atrophy in the general older adult population.
  • However, APOE-ɛ4 carriers may be more vulnerable to the adverse neurological effects of certain highly-chlorinated PCBs.