title: Temperature and the field stability of a dengue rapid diagnostic test in the tropics.
abstract: The global incidence of dengue has increased significantly in recent decades, resulting in a large public health burden in tropical and subtropical countries. Dengue rapid diagnostic tests (RDTs) can provide accurate, rapid accessible diagnosis for patient management and may be easily used by health workers in rural areas. However, in dengue-endemic areas, ambient temperatures are often higher than manufacturer's recommendation. We therefore evaluated the effect of high temperature over time on the performance of one commonly used dengue RDT, the Standard Diagnostics Bioline Dengue Duo. RDTs were kept in five different conditions (at 4°C, 35°C, 45°C, 60°C, and at fluctuant ambient temperatures in a free-standing hut) for between 2 days and 2 years in the Lao People's Democratic Republic (PDR). RDTs were tested with four control sera (negative, dengue nonstructural protein 1 [NS1], anti-dengue immunoglobulin [Ig] M, and anti-dengue IgG positive). The RDTs had 100% consistency over the 2-year study, despite high temperatures, including in the hut in which temperatures exceeded the manufacturer's recommendations for 29% of time points. These data suggest that the diagnostic accuracy of the SD Bioline Dengue Duo RDT remains stable even after long-term storage at high temperatures. Therefore, use at such ambient temperatures in tropical areas should not jeopardize the dengue diagnostic outcome.
authors.forename: Koukeo
authors.initials: K
authors.lastname: Phommasone
authors.forename: Onanong
authors.initials: O
authors.lastname: Sengvilaipaseuth
authors.forename: Xavier
authors.initials: X
authors.lastname: de Lamballerie
authors.forename: Manivanh
authors.initials: M
authors.lastname: Vongsouvath
authors.forename: Ooyanong
authors.initials: O
authors.lastname: Phonemixay
authors.forename: Stuart D
authors.initials: SD
authors.lastname: Blacksell
authors.forename: Paul N
authors.initials: PN
authors.lastname: Newton
authors.forename: Audrey
authors.initials: A
authors.lastname: Dubot-Pérès
mesh_terms: D000914:Antibodies, Viral / Q000276:immunology*; D000956:Antigens, Viral / Q000097:blood*; D003715:Dengue / Q000097:blood / Q000175:diagnosis* / Q000276:immunology; D003716:Dengue Virus / Q000276:immunology* / Q000302:isolation & purification; D006358:Hot Temperature / Q000009:adverse effects*; D006801:Humans; D007074:Immunoglobulin G / Q000276:immunology; D007075:Immunoglobulin M / Q000276:immunology; D011933:Reagent Kits, Diagnostic; D014329:Tropical Climate; D017361:Viral Nonstructural Proteins / Q000097:blood
chemical_list: D000914:Antibodies, Viral; D000956:Antigens, Viral; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D011933:Reagent Kits, Diagnostic; D017361:Viral Nonstructural Proteins