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Rapid detection of Babesia motasi responsible for human babesiosis by cross-priming amplification combined with a vertical flow.

Abstract：

BACKGROUND:Babesia motasi is known as an etiological agent of human and ovine babesiosis. Diagnosis of babesiosis is traditionally performed by microscopy, examining Giemsa-stained thin peripheral blood smears. Rapid detection and accurate identification of species are desirable for clinical care and epidemiological studies. METHODS:An easy to operate molecular method, which requires less capital equipment and incorporates cross-priming amplification combined with a vertical flow (CPA-VF) visualization strip for rapid detection and identification of B. motasi. RESULTS:The CPA-VF targets the 18S rRNA gene and has a detection limit of 50 fg per reaction; no cross reaction was observed with other piroplasms infective to sheep or Babesia infective to humans. CPA-VF and real-time (RT)-PCR had sensitivities of 95.2% (95% confidence interval, CI 78.1-99.4%) and 90.5% (95% CI 72-97.6%) and specificities of 95.8 (95% CI 80.5-99.5%) and 97.9 (95% CI 83.5-99.9%), respectively, versus microscopy and nested (n) PCR combined with gene sequencing. The clinical performance of the CPA-VF assay was evaluated with field blood samples from sheep (n = 340) in Jintai county, Gansu Province, and clinical specimens (n = 492) obtained from patients bitten by ticks. CONCLUSIONS:Our results indicate that the CPA-VF is a rapid, accurate, nearly instrument-free molecular diagnostic approach for identification of B. motasi. Therefore, it could be an alternative technique for epidemiological investigations and diagnoses of ovine and/or human babesiosis caused by B. motasi, especially in resource-limited regions.

journal_name

Parasit Vectors

journal_title

Parasites & vectors

authors

Wang J,Gao S,Zhang S,He X,Liu J,Liu A,Li Y,Liu G,Luo J,Guan G,Yin H

doi

10.1186/s13071-020-04246-4

subject

Has Abstract

pub_date

2020-07-29 00:00:00

pages

377

issue

1

issn

1756-3305

pii

10.1186/s13071-020-04246-4

journal_volume

13

pub_type

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