Quantitative Polymerase Chain Reaction from Malaria Rapid Diagnostic Tests to Detect Borrelia crocidurae, the Agent of Tick-Borne Relapsing Fever, in Febrile Patients in Senegal

Ndiaye El Hadji Ibrahima Aix Marseille Univ, Institut de Recherche pour le Développement (IRD), APHM, SSA, Vecteurs–Infections Tropicales et Méditerranéennes (VITROME), Marseille, France;
Institut Hospitalo-Universitaire (IHU) Méditerranée Infection, Marseille, France;
VITROME, IRD UMR 257, Campus International IRD-UCAD Hann, Dakar, Sénégal

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Georges Diatta VITROME, IRD UMR 257, Campus International IRD-UCAD Hann, Dakar, Sénégal

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Diarra Adama Zan Aix Marseille Univ, Institut de Recherche pour le Développement (IRD), APHM, SSA, Vecteurs–Infections Tropicales et Méditerranéennes (VITROME), Marseille, France;
Institut Hospitalo-Universitaire (IHU) Méditerranée Infection, Marseille, France;

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Hubert Bassene VITROME, IRD UMR 257, Campus International IRD-UCAD Hann, Dakar, Sénégal

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Cheikh Sokhna Institut Hospitalo-Universitaire (IHU) Méditerranée Infection, Marseille, France;
VITROME, IRD UMR 257, Campus International IRD-UCAD Hann, Dakar, Sénégal

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Philippe Parola Aix Marseille Univ, Institut de Recherche pour le Développement (IRD), APHM, SSA, Vecteurs–Infections Tropicales et Méditerranéennes (VITROME), Marseille, France;
Institut Hospitalo-Universitaire (IHU) Méditerranée Infection, Marseille, France;

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ABSTRACT.

In endemic malaria areas, Plasmodium is currently diagnosed mainly through the use of rapid diagnostic tests (RDTs). However, in Senegal, many causes of fever remain unknown. Tick-borne relapsing fever, an often-neglected public health problem, is the main cause of consultation for acute febrile illness after malaria and flu in rural areas. Our objective was to test the feasibility of extracting and amplifying DNA fragments by quantitative polymerase chain reaction (qPCR) from malaria-negative RDTs for Plasmodium falciparum (malaria Neg RDTs P.f) to detect Borrelia spp. and other bacteria. Between January and December 2019, malaria Neg RDTs P.f were collected on a quarterly basis in 12 health facilities in four regions of Senegal. The DNA extracted from the malaria Neg RDTs P.f was tested using qPCR and the results were confirmed by standard PCR and sequencing. Only Borrelia crocidurae DNA was detected in 7.22% (159/2,202) of RDTs. The prevalence of B. crocidurae DNA was higher in July (16.47%, 43/261) and August (11.21%, 50/446). The annual prevalence was 9.2% (47/512) and 5.0% (12/241) in Ngayokhem and Nema-Nding, respectively, health facilities in the Fatick region. Our study confirms that B. crocidurae infection is a frequent cause of fever in Senegal, with a high prevalence of cases in health facilities in the regions of Fatick and Kaffrine. Malaria Neg RDTs P.f are potentially a good source of pathogen sampling for the molecular identification of other causes of fever of unknown origin, even in the most remote areas.

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Author Notes

Address correspondence to Philippe Parola, Aix Marseille Univ, Institut de Recherche pour le Développement (IRD), Vecteurs–Infections Tropicales et Méditerranéennes (VITROME), 19–21 Blvd. Jean Moulin, 13005 Marseille, France. E-mail: philippe.parola@univ-amu.fr

Authors’ addresses: Ndiaye El Hadji Ibrahima, Aix Marseille Univ, Institut de Recherche pour le Développement (IRD), Vecteurs–Infections Tropicales et Méditerranéennes (VITROME), Marseille, France, Institut Hospitalo-Universitaire (IHU) Méditerranée Infection, Marseille, France, and Campus International de Recherche IRD-UCAD Hann, UMR 257 VITROME, Dakar, Sénégal, E-mail: el-hadji-ibrahima.ndiaye@ird.fr. Georges Diatta, Campus International de Recherche IRD-UCAD Hann, UMR 257 VITROME, Dakar, Sénégal, E-mail: georges.diatta@ird.fr. Diarra Adama Zan, Aix Marseille Univ, IRD, VITROME, Marseille, France, and IHU Méditerranée Infection, Marseille, France, E-mail: adamazandiarra@gmail.com. Hubert Bassene, Campus International de Recherche IRD-UCAD Hann, UMR 257 VITROME, Dakar, Sénégal, E-mail: hubert.bassene@ird.fr. Cheikh Sokhna, IHU Méditerranée Infection, Marseille, France, and Campus International de Recherche IRD-UCAD Hann, UMR 257 VITROME, Dakar, Sénégal, E-mail: cheikh.sokhna@ird.fr. Philippe Parola, Aix Marseille Univ, IRD, VITROME, Marseille, France, and IHU Méditerranée Infection, Marseille, France, E-mail: philippe.parola@univ-amu.fr.

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