Summary Sudden increases in disease severity, manifested in Cuba by month-to-month changes in proportion of severe to mild disease and case–fatality rates were reported among secondary dengue virus type 2 (DENV2) infections in 1981 and 1997. A similar phenomenon was described for secondary DENV3 infections in 2001. Year-to-year increases in the proportion of severe DENV2 disease have been described in Nicaragua and Taiwan. Full-length sequencing of over 200 viruses recovered from before and after pathogenicity changes in Nicaragua identified a complex stable clade change, consisting of nine amino acid changes, one each in envelope, NS3, NS4B and capsid, two in NS1 and three in NS5, as well as four changes to the nontranslated region. Secondary DENV2 infections with this clade change resulted in severe disease in children who had previously experienced DENV3 infections. A clade change was also found in the 1997 Cuban outbreak and consisted of single amino acid changes in NS1 and NS5. The NS1 change, T164S, was dominant, occurring in February and persisted to the end of the outbreak in July. This clade change was also correlated with a progressive increase in the epidemic reproductive number (R0). In Taiwan, only a silent clade change was detected between viruses recovered before and during the period of increased severity. This phenomenon provides abundant research reagents in Cuba and Nicaragua including monotypic DENV1 or DENV3 human sera and the DENV2s recovered before and after the pathogenicity changes. These should be tested in primary human myeloid cells as a useful in vitro model to study intrinsic mechanisms of antibody-dependent dengue infection enhancement.
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