Genetic evidence of focal plasmodium falciparum transmission in a pre-elimination setting in Southern Province, Zambia

Julia C. Pringle, Sofonias Tessema, Amy Wesolowski, Anna Chen, Maxwell Murphy, Giovanna Carpi, Timothy M. Shields, Harry Hamapumbu, Kelly M. Searle, Tamaki Kobayashi, Ben Katowa, Michael Musonda, Jennifer C. Stevenson, Philip E. Thuma, Bryan Greenhouse, William J. Moss, Douglas E. Norris

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Background. Southern Province, Zambia has experienced a dramatic decline in Plasmodium falciparum malaria transmission in the past decade and is targeted for elimination. Zambia's National Malaria Elimination Program recommends reactive case detection (RCD) within 140 m of index households to enhance surveillance and eliminate remaining transmission foci. Methods. To evaluate whether RCD captures local transmission, we genotyped 26 microsatellites from 106 samples collected from index (n = 27) and secondary (n = 79) cases detected through RCD in the Macha Hospital catchment area between January 2015 and April 2016. Results. Participants from the same RCD event harbored more genetically related parasites than those from different RCD events, suggesting that RCD captures, at least in part, infections related through local transmission. Related parasites clustered in space and time, up to at least 250 m from index households. Spatial analysis identifed a putative focal transmission hotspot. Conclusions. Te current RCD strategy detects focal transmission events, although programmatic guidelines to screen within 140 m of index households may fail to capture all secondary cases. Tis study highlights the utility of parasite genetic data in assessing programmatic interventions, and similar approaches may be useful to malaria elimination programs seeking to tailor intervention strategies to the underlying transmission epidemiology.

Original languageEnglish (US)
Pages (from-to)1254-1263
Number of pages10
JournalJournal of Infectious Diseases
Issue number8
StatePublished - Apr 8 2019


  • Malaria
  • Microsatellites
  • Molecular epidemiology
  • Reactive case detection
  • Screen-and-treat

ASJC Scopus subject areas

  • Immunology and Allergy
  • Infectious Diseases


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