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Carabali, Mabel,Lim, Jacqueline K.,Palencia, Diana C.,Lozano‐,Parra, Anyela,Gelvez, Rosa Margarita,Lee, Kang Sung,Florez, Janeth P.,Herrera, Victor Mauricio,Kaufman, Jay S.,Rojas, Elsa M.,Villar John Wiley and Sons Inc. 2018 Tropical medicine & international health Vol.23 No.11
<P><B>Abstract</B></P><P><B>Objective</B></P><P>To estimate the age‐specific incidence of symptomatic dengue and chikungunya in Colombia.</P><P><B>Method</B></P><P>A passive facility‐based fever surveillance study was conducted among individuals with undifferentiated fever. Confirmatory diagnostics included serological and molecular tests in paired samples, and surveillance's underreporting was assessed using capture–recapture methods.</P><P><B>Results</B></P><P>Of 839 febrile participants 686 completed the study. There were 33.2% (295/839) dengue infections (51% primary infections), and 35.9% (191/532) of negative dengue cases there were chikungunya cases. On average, dengue cases were younger (median = 18 years) than chikungunya cases (median = 25 years). Thrombocytopaenia and abdominal pain were the main dengue predictors, while presence of rash was the main predictor for chikungunya diagnosis. Underreporting of dengue was 31%; the estimated expansion factors indicate an underreporting rate of dengue cases of threefold for all cases and of almost sixfold for inpatients.</P><P><B>Conclusions</B></P><P>These findings highlight the ongoing coexistence of both arboviruses, a distinct clinical profile of each condition in the study area that could be used by clinicians to generate a differential diagnosis, and the presence of underreporting, mostly among hospitalised cases.</P>