Séverine Matheus1, Patricia Huc2, Bhety Labeau3, Laetitia Bremand3, Antoine Enfissi3, Olivier Merle4, Olivier Flusin4, Dominique Rousset3, Isabelle Leparc-Goffart4. 1. Laboratoire de Virologie, Centre National de Référence des Arbovirus, Laboratoire associé, Institut Pasteur de la Guyane, Cayenne, French Guiana. Electronic address: smatheus@pasteur-cayenne.fr. 2. Laboratoire d'Analyses Médicales Saint-Martin Biologie, Saint-Martin, France. 3. Laboratoire de Virologie, Centre National de Référence des Arbovirus, Laboratoire associé, Institut Pasteur de la Guyane, Cayenne, French Guiana. 4. Centre National de Référence des Arbovirus, Institut de Recherche Biomédicale des Armées, Marseille, France.
Abstract
BACKGROUND: The recent emergence of Chikungunya Virus (CHIKV) in the Americas constitutes a major public health problem on this continent, where the mosquito vector is widespread. The rapid diagnosis of suspected cases is essential for the monitoring and control of this ongoing outbreak. However, this requires reliable tools that are difficult to establish in areas without specialized laboratories. OBJECTIVES: The aim was to evaluate the performances of serum samples spotted onto filter paper for molecular and serological diagnosis of Chikungunya infection. STUDY DESIGN: Analyses were performed from frozen sera and serum spotted onto filter paper provided from 121 Chikungunya suspected cases collected at a biological laboratory on Saint-Martin Island. RESULTS: This approach performed well in comparisons with standard methods, with a sensitivity of 100% and a specificity of 93.6% for the combined technical approaches (RT-PCR and serological results). Comparisons of serum samples spotted onto filter paper and frozen samples showed a concordance rate of 94.8% in molecular tests and 98.2% in serological tests. CONCLUSIONS: This simple sampling technique could overcome the problems of the lack of efficient CHIKV diagnosis tools in remote regions, providing good results regardless of the molecular or serological approach used. This simple filter paper-based method can be used to diagnose both chikungunya and dengue infections, as previously demonstrated following transport at ambient temperature to specialized laboratories. Given the set-up costs and high performance of this method, it could be recommended for the monitoring and control of Chikungunya virus expansion in the Americas and in other affected regions.
BACKGROUND: The recent emergence of Chikungunya Virus (CHIKV) in the Americas constitutes a major public health problem on this continent, where the mosquito vector is widespread. The rapid diagnosis of suspected cases is essential for the monitoring and control of this ongoing outbreak. However, this requires reliable tools that are difficult to establish in areas without specialized laboratories. OBJECTIVES: The aim was to evaluate the performances of serum samples spotted onto filter paper for molecular and serological diagnosis of Chikungunya infection. STUDY DESIGN: Analyses were performed from frozen sera and serum spotted onto filter paper provided from 121 Chikungunya suspected cases collected at a biological laboratory on Saint-Martin Island. RESULTS: This approach performed well in comparisons with standard methods, with a sensitivity of 100% and a specificity of 93.6% for the combined technical approaches (RT-PCR and serological results). Comparisons of serum samples spotted onto filter paper and frozen samples showed a concordance rate of 94.8% in molecular tests and 98.2% in serological tests. CONCLUSIONS: This simple sampling technique could overcome the problems of the lack of efficient CHIKV diagnosis tools in remote regions, providing good results regardless of the molecular or serological approach used. This simple filter paper-based method can be used to diagnose both chikungunya and dengue infections, as previously demonstrated following transport at ambient temperature to specialized laboratories. Given the set-up costs and high performance of this method, it could be recommended for the monitoring and control of Chikungunya virus expansion in the Americas and in other affected regions.
Authors: Philip Koliopoulos; Neema Mathias Kayange; Tim Daniel; Florian Huth; Britta Gröndahl; Grey Carolina Medina-Montaño; Leah Pretsch; Julia Klüber; Christian Schmidt; Antke Züchner; Sebastian Ulbert; Steven E Mshana; Marylyn Addo; Stephan Gehring Journal: Malar J Date: 2021-02-01 Impact factor: 2.979