Real-time PCR detection of mixed Plasmodium ovale curtisi and wallikeri infections in human and mosquito hosts
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Potlapalli, Varun R, et al. Real-time Pcr Detection of Mixed Plasmodium Ovale Curtisi and Wallikeri Infections In Human and Mosquito Hosts. Public Library of Science, 2023. https://doi.org/10.17615/c7x5-2f78APA
Potlapalli, V., Muller, M., Ngasala, B., Ali, I., Na, Y., Williams, D., Kharabora, O., Chhetri, S., Liu, M., Carey Ewend, K., Lin, F., Mathias, D., Tarimo, B., Juliano, J., Parr, J., & Lin, J. (2023). Real-time PCR detection of mixed Plasmodium ovale curtisi and wallikeri infections in human and mosquito hosts. Public Library of Science. https://doi.org/10.17615/c7x5-2f78Chicago
Potlapalli, Varun R., Meredith S Muller, Billy Ngasala, Innocent Mbulli Ali, Yu Bin Na, Danielle R Williams, Oksana Kharabora et al. 2023. Real-Time Pcr Detection of Mixed Plasmodium Ovale Curtisi and Wallikeri Infections In Human and Mosquito Hosts. Public Library of Science. https://doi.org/10.17615/c7x5-2f78- Creator
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Potlapalli, Varun R.
- Affiliation: School of Medicine
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Muller, Meredith S.
- Affiliation: School of Medicine
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Ngasala, Billy
- Other Affiliation: Muhimbili University of Health and Allied Sciences
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Ali, Innocent Mbulli
- Other Affiliation: University of Dschang
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Na, Yu Bin
- Affiliation: School of Medicine
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Williams, Danielle R.
- Affiliation: School of Medicine, Department of Microbiology and Immunology
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Kharabora, Oksana
- Affiliation: School of Medicine
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Chhetri, Srijana
- Affiliation: School of Medicine
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Liu, Mei S.
- Affiliation: School of Medicine
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Carey-Ewend, Kelly
- Affiliation: Gillings School of Global Public Health
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Lin, Feng-Chang
- Affiliation: Gillings School of Global Public Health
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Mathias, Derrick
- Other Affiliation: University of Florida
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Tarimo, Brian B.
- Other Affiliation: Ifakara Health Institute-Bagamoyo Office
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Juliano, Jonathan J.
- Affiliation: Gillings School of Global Public Health
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Parr, Jonathan B.
- Other Affiliation: School of Medicine
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Lin, Jessica T.
- Other Affiliation: School of Medicine
- Abstract
- Plasmodium ovale curtisi (Poc) and Plasmodium ovale wallikeri (Pow) represent distinct non-recombining Plasmodium species that are increasing in prevalence in sub-Saharan Africa. Though they circulate sympatrically, co-infection within human and mosquito hosts has rarely been described. Separate 18S rRNA real-time PCR assays that detect Poc and Pow were modified to allow species determination in parallel under identical cycling conditions. The lower limit of detection was 0.6 plasmid copies/μL (95% CI 0.4–1.6) for Poc and 4.5 plasmid copies/μL (95% CI 2.7–18) for Pow, or 0.1 and 0.8 parasites/μL, respectively, assuming 6 copies of 18s rRNA per genome. However, the assays showed cross-reactivity at concentrations greater than 103 plasmid copies/μL (roughly 200 parasites/μL). Mock mixtures were used to establish criteria for classifying mixed Poc/Pow infections that prevented false-positive detection while maintaining sensitive detection of the minority ovale species down to 100 copies/μL (<1 parasite/μL). When the modified real-time PCR assays were applied to field-collected blood samples from Tanzania and Cameroon, species identification by real-time PCR was concordant with nested PCR in 19 samples, but additionally detected two mixed Poc/Pow infections where nested PCR detected a single Po species. When real-time PCR was applied to oocyst-positive Anopheles midguts saved from mosquitoes fed on P. ovale-infected persons, mixed Poc/Pow infections were detected in 11/14 (79%). Based on these results, 8/9 P. ovale carriers transmitted both P. ovale species to mosquitoes, though both Po species could only be detected in the blood of two carriers. The described real-time PCR approach can be used to identify the natural occurrence of mixed Poc/Pow infections in human and mosquito hosts and reveals that such co-infections and co-transmission are likely more common than appreciated.
- Date of publication
- 2023
- Keyword
- DOI
- Identifier
- Resource type
- Article
- Rights statement
- In Copyright
- License
- Attribution 4.0 International
- Journal title
- PLOS Neglected Tropical Diseases
- Journal volume
- 17
- Journal issue
- 12
- Page start
- e0011274
- Language
- English
- Version
- Publisher
- ISSN
- 1935-2735
- Publisher
- Public Library of Science
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