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Multistate foodborne outbreaks pose significant public health risks and require meticulous investigation to identify sources and implement control measures. The Centers for Disease Control and Prevention (CDC) utilizes a dynamic seven-step process for these investigations, integrating data from laboratories, interviews, and environmental assessments to protect public health.Outbreak Detection: The detection of multistate outbreaks typically begins with PulseNet, the CDC's national laboratory...
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SARS-CoV-2 Detection and Persistence in a Remote Amazonian Settlement.

Glauco M Silva1, Roberto C Ilacqua1, Franciely G Gonçalves2

  • 1Graduate Program in Health Sciences, FMABC University Center, Santo André, São Paulo, Brazil.

Journal of Tropical Medicine
|December 11, 2025
PubMed
Summary

SARS-CoV-2 (severe acute respiratory syndrome coronavirus 2) was detected in a remote Brazilian Amazon community. The virus persisted within households, indicating ongoing transmission risks in isolated populations.

Keywords:
Amazon rainforestCOVID-19SARS-CoV-2rural healthspatial analysis

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Area of Science:

  • Epidemiology
  • Virology
  • Public Health

Background:

  • COVID-19 remains a global health concern, with significant outbreaks occurring even in geographically isolated areas like Acre state, Brazil.
  • This study focused on the rural settlement of Santa Luzia in Cruzeiro do Sul, Acre, Brazil, a region distant from major urban centers.
  • Understanding SARS-CoV-2 dynamics in remote communities is crucial for effective public health strategies.

Purpose of the Study:

  • To assess the detection and persistence of SARS-CoV-2 in a remote Amazonian rural settlement.
  • To investigate the prevalence and distribution of SARS-CoV-2 within households in the Santa Luzia community.
  • To inform public health surveillance efforts in geographically isolated populations.

Main Methods:

  • A cross-sectional survey was conducted in July 2022, involving 183 individuals from 40 families across 40 selected sites.
  • Saliva samples were collected from residents aged 5-90 years.
  • Nucleic acid extraction and multiplex RT-qPCR were employed for SARS-CoV-2 detection, complemented by spatial analysis using Global and Local Moran's I statistics.

Main Results:

  • An 8% SARS-CoV-2 positivity rate was observed among the 183 individuals surveyed, with variations noted by age and sex.
  • At least one family member tested positive in 30% of the participating families, indicating sustained viral presence.
  • Spatial analysis revealed a random distribution of positive samples, suggesting multiple introductions from urban areas and ongoing local persistence.

Conclusions:

  • SARS-CoV-2 continues to be detected and persist in remote Amazonian communities like Santa Luzia.
  • The findings underscore the importance of tailored surveillance strategies for geographically isolated populations.
  • Continued monitoring is essential to manage COVID-19 transmission in areas with limited access to healthcare infrastructure.