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Related Concept Videos

Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

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Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
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Related Experiment Video

Updated: Jun 6, 2025

In Vivo Assessment of Rodent Plasmodium Parasitemia and Merozoite Invasion by Flow Cytometry
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Remoscope: a label-free imaging cytometer for malaria diagnostics.

Paul M Lebel1, Ilakkiyan Jeyakumar1, Michelle W L Khoo1

  • 1Chan Zuckerberg Biohub SF, 499 Illinois Street, San Francisco, CA.

Medrxiv : the Preprint Server for Health Sciences
|November 28, 2024
PubMed
Summary
This summary is machine-generated.

Remoscope, a novel automated imaging cytometer, offers rapid, label-free malaria diagnosis by analyzing millions of red blood cells. This portable device provides accurate detection of Plasmodium falciparum, addressing key challenges in high-transmission settings.

Keywords:
Malariadiagnosticslabel-free imagingmachine learning

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Area of Science:

  • Biomedical Engineering
  • Parasitology
  • Medical Diagnostics

Background:

  • Malaria diagnosis in high-transmission areas faces challenges with existing healthcare system burdens.
  • Accurate and rapid diagnostic tools are crucial for effective malaria control and treatment.

Purpose of the Study:

  • To introduce Remoscope, a portable, automated imaging cytometer for label-free, stage-specific detection of Plasmodium falciparum (Pf).
  • To evaluate Remoscope's performance in vitro and in real-world diagnostic accuracy in a high-transmission setting.

Main Methods:

  • Remoscope utilizes a custom neural network on low-cost hardware to scan unstained whole blood, analyzing up to two million red blood cells.
  • The system employs flow cytometry principles for high cellular throughput in disposable flow cartridges.
  • Performance was benchmarked using in vitro parasite titrations and compared against qPCR and microscopy in a clinical cohort.

Main Results:

  • Remoscope demonstrated a linear response across a wide range of parasite concentrations (17.1-710,000 parasites/μL).
  • In vitro drug susceptibility assays showed comparable results to conventional flow cytometry (EC50 for chloroquine: 211 nM vs. 191 nM).
  • Clinical evaluation in Uganda (500 individuals, 601 visits) showed a limit of detection of 95.1 parasites/μL with high sensitivity (83%), specificity (96%), PPV (91%), and NPV (93%).

Conclusions:

  • Remoscope offers a rapid, accurate, and low-cost solution for malaria diagnosis, addressing practical challenges in global health settings.
  • Its capabilities extend beyond malaria, potentially aiding in the diagnosis of other blood-related disorders.
  • The device's ease of use and portability make it suitable for widespread deployment in resource-limited environments.