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June 28, 2021 More than 2,700 dengue cases have been reported since the start of the year. The Straits Times SINGAPORE - New strains of less common dengue serotypes, which are usually imported, could raise the risk of a larger outbreak, say experts. Of the four distinct dengue virus variations, the DenV-1 and DenV-2 serotypes are most commonly seen here. The majority of infections since 2016 have been caused by DenV-2 - meaning that most recovered dengue patients would have immunity against this serotype. However, DenV-3 and DenV-4 accounted for more than half of the dengue cases sampled here since February. Last year saw the first DenV-3 outbreak here in three decades and a fourfold spike in DenV-4 cases, from 4.8 per cent of infections in January to 23.1 per cent by December.

Saudi arabiaLok shee meiPaul tambyahInfectious diseases programme atAsia pacific society of clinical microbiologyCentre for infectious disease epidemiologyNational environment agencyStraits timesAsia pacific societyClinical microbiologySoutheast asianProf tambyahEmerging infectious diseases programmeSoutheast asiaProfessor vincent pangInfectious disease epidemiology