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Occurrence of Rickettsia spp. and Coxiella burnetii in ixodid ticks in Kassena-Nankana, Ghana

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Abstract

Ticks are arthropods of veterinary and medical importance which spread zoonotic pathogens that link animal and human health. In this study, ticks were collected from 448 livestock between February and December 2020 in the Kassena-Nankana Districts of Ghana and screened for the presence of zoonotic pathogens DNA using PCR and sequencing approaches. In total, 1550 ticks were collected and morphologically identified. Three tick genera were identified with Amblyomma variegatum (63%) as the predominant tick species collected. DNA was extracted from 491 tick pools and screened for the presence of DNA of Rickettsia spp. based on the 115 bp fragment of the 17 kDa surface protein and 639 bp of the Outer membrane protein A (ompA) gene and the 295 bp fragment of the transposase gene of Coxiella burnetii IS1111a element. From the 491 pools screened, the DNA of Rickettsia spp. and C. burnetii was detected in 56.8 and 3.7%, respectively. Coinfections were identified in 2.4% of the tick pools. Characterization of the Rickettsia spp. in this study based on the ompA gene showed that the DNA of Rickettsia africae and Rickettsia aeschlimannii accounted for 39.7 and 14.7%, respectively, and were 100% similar to sequences in GenBank. Most R. africae and C. burnetii infections occurred in ticks collected in the wet season, whereas R. aeschlimannii occurred mostly in the dry season. These pathogens are potential public health threats, thus there is a need to implement control measures to reduce the risk of infections in vulnerable populations.

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Acknowledgements

The authors wish to express their gratitude to the Navrongo Health Research Centre and the Parasitology Department of Noguchi Memorial Institute for Medical Research for their support and contribution towards this study.

Funding

This study was supported by the Uniformed Services University Center for Global Health Engagement (CGHE) through the Global Health Engagement Research Initiative (Grant number: GRANT12767296).

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SOA wrote the first draft of the manuscript. SOA, REB, BOAB, KNY, BA and AAN conducted the laboratory analysis. EB performed the data analysis. JAL, PKB, MDW, VA, MS, JCD and SKD supervised the study. SOA, SM, JWD and SKD designed the study. All authors reviewed and approved the final manuscript.

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Correspondence to Seth Offei Addo or Samuel K. Dadzie.

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The authors declare no competing interests.

Ethical approval

For this study was obtained from the University of Ghana Institutional Animal Care and Use Committee (UG-IACUC; UG-IACUC 001/19–20). The views expressed in this article are those of the authors and do not necessarily reflect the official policy or position of the Department of the Navy, Department of Defense, or the US Government. Opinions, interpretations, conclusions, and recommendations are those of the authors and are not necessarily endorsed by the US Army. Joseph W. Diclaro II, James C. Dunford and Suzanne Mate are military service members or employees of the US Government. This work was prepared as part of their official duties. Title 17 USC § 105 provides that ‘Copyright protection under this title is not available for any work of the United States Government’. Title 17 USC § 101 defines US Government work as work prepared by a military service member or employee of the US Government as part of that person’s official duties.

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Addo, S.O., Bentil, R.E., Baako, B.O.A. et al. Occurrence of Rickettsia spp. and Coxiella burnetii in ixodid ticks in Kassena-Nankana, Ghana. Exp Appl Acarol 90, 137–153 (2023). https://doi.org/10.1007/s10493-023-00808-0

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