Chikungunya Infection in Hospitalized Febrile Infants Younger Than 3 Months of Age

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Background:Fever in infants younger than 3 months is generally a cause for concern because of the risk for a serious bacterial infection. The aim of this study was to describe clinical and biologic features of Chikungunya infection in infants <3 months of age hospitalized in Cayenne Hospital during the 2014–2015 outbreak.Methods:We performed a preliminary retrospective study followed by a prospective study from March 2014 to February 2015. All infants younger than 3 months presenting with fever and hospitalized in Cayenne Hospital were included. The main diagnostic criteria were fever and positive Chikungunya polymerase chain reaction.Results:One hundred and twenty infants were hospitalized with fever. The mean age was 46 days (standard deviation ± 22 days). The mean hospitalization duration was 7.4 days (standard deviation ± 6.1 days). Chikungunya infection was diagnosed in 26 children. The most important clinical findings were high [80.8% (77.5–84)] and prolonged fever [76.9% (73.4–80.4)], irritability [96.2% (94.5–97.7)] and skin rash [69.2% (65.4–73)]. Half of the infants presented edema of the extremities (hands and feet principally). However, in 15% of infants, Chikungunya infection was associated with a serious bacterial infection. Infants who presented with irritability, high fever and elevated PCT were at high risk for Chikungunya: OR 39 (9.2–243; P < .001), with a specificity of 96.7% and a negative predictive value of 89.4%. The area of the receiver operating characteristic curve was 0.96.Conclusions:Our results confirm that Chikunguyna infection is a cause of high fever in infants younger than 3 months. Our data should be confirmed by larger studies.

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