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WHO report: Hotter temperatures cause the virus to flare, leading to a record number of cases of dengue infection this year.

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In a recent report published by WHO, it has been sounded that there is a fear of a thirtyfold surge in Dengue in India and other parts of Southeast Asia. WHO has also identified the platelet - of platelet-related infections as one of the reasons since the dengue virus was identified in 1943. Urbanization and international travel are key factors facilitating the spread of dengue, WHO says. The report underscores the transmission of the virus to the eggs of female Aedes mosquitoes resulting in mosquitoes born with the virus. This emphasizes the need for comprehensive vector control strategies encompassing adult mosquito larvae and eggs, The report also says that potential human-to-human transmission through blood transfusions, needle stick injuries, and mother-to-child transmission.

Dengue transmission is cyclic and large outbreaks every 3-4 years can be expected. During the COVID-19 pandemic, we saw moderate transmission of dengue in some regions and low transmission in others leading to an accumulation of people without immunity to certain dengue virus serotypes. However, the data on the circulating dengue serotypes is limited.  

Since the beginning of 2023, ongoing transmission, combined with an unexpected spike in dengue cases has resulted in close to a historic high of over five million cases and more than 5000 dengue-related deaths reported in over 80 countries/territories and five WHO regions: Africa, Americas, South-East Asia, Western Pacific and Eastern Mediterranean Regions globally (Figure 1). Close to 80% of these cases, or 4.1 million, have been reported in the Region of the Americas. Dengue is the most widespread arbovirus and causes the highest number of arboviral disease cases in the Region of the Americas, with cyclic epidemics recurring every 3 to 5 years. In addition, clusters of autochthonous dengue have been reported in the WHO European Region. However, these numbers are likely an underestimate of the true burden as most of the primary infections are asymptomatic and dengue reporting is not mandatory in many countries.     

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