Fig. 1From: Clinical evaluation of dengue and identification of risk factors for severe disease: protocol for a multicentre study in 8 countriesDiagnostic Algorithm. PCR and NS1 results are obtained from analyzing the enrolment sample while IgM and IgG results are obtained from analyzing an acute phase sample (S1) and a follow-up/early convalescent phase sample (S2). In the presence of a clinical syndrome that might be dengue, a positive result on any of the first 3 tests is sufficient for a diagnosis of “laboratory confirmed acute dengue” Back to article page