Sample pooling methods for efficient pathogen screening: Practical implications

PLoS One. 2020 Nov 11;15(11):e0236849. doi: 10.1371/journal.pone.0236849. eCollection 2020.

Abstract

Due to the large number of negative tests, individually screening large populations for rare pathogens can be wasteful and expensive. Sample pooling methods improve the efficiency of large-scale pathogen screening campaigns by reducing the number of tests and reagents required to accurately categorize positive and negative individuals. Such methods rely on group testing theory which mainly focuses on minimizing the total number of tests; however, many other practical concerns and tradeoffs must be considered when choosing an appropriate method for a given set of circumstances. Here we use computational simulations to determine how several theoretical approaches compare in terms of (a) the number of tests, to minimize costs and save reagents, (b) the number of sequential steps, to reduce the time it takes to complete the assay, (c) the number of samples per pool, to avoid the limits of detection, (d) simplicity, to reduce the risk of human error, and (e) robustness, to poor estimates of the number of positive samples. We found that established methods often perform very well in one area but very poorly in others. Therefore, we introduce and validate a new method which performs fairly well across each of the above criteria making it a good general use approach.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Computer Simulation
  • Coxiella / isolation & purification*
  • Diagnostic Tests, Routine / methods*
  • Gram-Negative Bacterial Infections / diagnosis*
  • Gram-Negative Bacterial Infections / microbiology
  • Humans
  • Mass Screening / methods*
  • Specimen Handling / methods*

Supplementary concepts

  • Coxiella cheraxi

Associated data

  • figshare/10.6084/m9.figshare.12543395

Grants and funding

This work was funded under the State of Arizona Technology and Research Initiative Fund (TRIF), administered by the Arizona Board of Regents, through Northern Arizona University awarded to VYF. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.